A genus of large sea birds, including the albatross. See Albatross.

An insectivorous plant. See Venus's flytrap.

Any of the festivals held in honor of the Olympian god Dionysus. They correspond to the Roman Bacchanalia; the greater Dionysia were held at Athens in March or April, and were celebrated with elaborate performances of both tragedies and comedies.

Of or pertaining to Dionysus or to the Dionysia; Bacchic; as, a Dionysiac festival; the Dionysiac theater at Athens.

Relating to Dionysius, a monk of the 6th century; as, the Dionysian, or Christian, era.

Originated or taught by Diophantus, the Greek writer on algebra.

A crystallized variety of pyroxene, of a clear, grayish green color; mussite.

A hydrous silicate of copper, occurring in emerald-green crystals.

An optical instrument, invented by Hipparchus, for taking altitudes, leveling, etc.

A unit employed by oculists in numbering glasses according to the metric system; a refractive power equal to that of a glass whose principal focal distance is one meter.

Of or pertaining to the dioptre, or to the metric system of numbering glasses. A dioptre. See Dioptre.

Of or pertaining to dioptrics; assisting vision by means of the refraction of light; refractive; as, the dioptric system; a dioptric glass or telescope.

The science of the refraction of light; that part of geometrical optics which treats of the laws of the refraction of light in passing from one medium into another, or through different mediums, as air, water, or glass, and esp. through different lenses; -- distinguished from catoptrics, which refers to reflected light.

A dioptre.

A mode of scenic representation, invented by Daguerre and Bouton, in which a painting is seen from a distance through a large opening. By a combination of transparent and opaque painting, and of transmitted and reflected light, and by contrivances such as screens and shutters, much diversity of scenic effect is produced.

Pertaining to a diorama.

Definition; logical direction.

Distinguishing; distinctive; defining.

An igneous, crystalline in structure, consisting essentially of a triclinic feldspar and hornblende. It includes part of what was called greenstone.

Containing diorite.

Relating to the correcting or straightening out of something; corrective.

A genus of plants, the roots of which are eaten as yams. See Yam.

a natural family of tuberous plants including the yams.

A vase or drinking cup having two handles or ears.

An oxide containing two atoms of oxygen in each molecule; binoxide. An oxide containing but one atom or equivalent of oxygen to two of a metal; a suboxide.

A white, crystalline, nitrogenous substance obtained by the reduction of isatin. It is a member of the indol series; -- hence its name.

The action of dipping or plunging for a moment into a liquid.

Including two passovers.

See Dabchick.

Having two petals; two-petaled.

A white crystalline substance, C6H5.C6H5, obtained by leading benzene through a heated iron tube. It consists of two benzene or phenyl radicals united.

A very dangerous contagious disease in which the air passages, and especially the throat, become coated with a false membrane, produced by the solidification of an inflammatory exudation. Cf. Group.

Relating to diphtheria; diphtheritic.

Pertaining to, or connected with, diphtheria.

To form or pronounce as a diphthong; diphthongize.

Relating or belonging to a diphthong; having the nature of a diphthong.

To make into a diphthong; to pronounce as a diphthong.

See Diphthongization.

Of the nature of diphthong; diphthongal.

The act of changing into a diphthong.

To change into a diphthong, as by affixing another vowel to a simple vowel.

Having the tail fin divided into two equal parts by the notochord, or end of the vertebral column; protocercal. See Protocercal.

Having two modes of embryonic development.

Having two leaves, as a calyx, etc.

Having two successive sets of teeth (deciduous and permanent), one succeeding the other; as, a diphyodont mammal; diphyodont dentition; -- opposed to monophyodont. An animal having two successive sets of teeth.

One of the free-swimming sexual zooids of Siphonophora.

Of or pertaining to two planes.

An instrument for determining the time of apparent noon. It consists of two mirrors and a plane glass disposed in the form of a prism, so that, by the reflections of the sun's rays from their surfaces, two images are presented to the eye, moving in opposite directions, and coinciding at the instant the sun's center is on the meridian.

Pertaining to the sending of two messages in the same direction at the same time. Diplex and contraplex are the two varieties of duplex.

Characterizing the ovum when it has two primary germinal layers.

Having the heart completely divided or double, one side systemic, the other pulmonary.

A form of micrococcus in which cocci are united in a binary manner. See Micrococcus.

The soft, spongy, or cancellated substance between the plates of the skull.

Diploic.

Partaking of the nature of two bodies; producing two substances.

An instrument used for double writing, as one for producing embossed writing for the blind and ordinary writing at the same time.

Of or pertaining to the diplo/.

having a number of chromosomes corresponding to two copies of each chromosome; having double the basic number of chromosomes, as seen in a haploid cell. Contrasted to haploid and polyploid.

A letter or writing, usually under seal, conferring some privilege, honor, or power; a document bearing record of a degree conferred by a literary society or educational institution.

The art and practice of conducting negotiations between nations (particularly in securing treaties), including the methods and forms usually employed.

A diplomatist.

Diplomatic.

A minister, official agent, or envoy to a foreign court; a diplomatist.

Pertaining to diplomacy; relating to the foreign ministers at a court, who are called the diplomatic body.

According to the rules of diplomacy; in the manner of a diplomatist; artfully.

The science of diplomas, or the art of deciphering ancient writings, and determining their age, authenticity, etc.; paleography.

Diplomacy.

A person employed in, or skilled in, diplomacy; a diplomat.

One of the Diplopoda.

An order of myriapods having two pairs of legs on each segment; the Chilognatha.

The act or state of seeing double.

Having twice as many stamens as petals, as the geranium.

The condition of being diplostemonous.

the fourth stage of the prophase of meiosis, when the paired chromosomes being to separate. This stage follows the pachytene.

A group of spiders having only two lunglike organs.

A group of ganoid fishes, including the living genera Ceratodus and Lepidosiren, which present the closest approximation to the Amphibia. The air bladder acts as a lung, and the nostrils open inside the mouth. See Ceratodus, and Illustration in Appendix.

a genus of rodents of the family Heteromyidae, comprising the genus of kangaroo rats which live in arid regions of Mexico and the western U. S.

Two metrical feet taken together, or included in one measure.

a genus of plants consisting of one species, the Australian pea.

Having two poles, as a magnetic bar.

having an abnormal sagging of the spine, especially in horses.

One who, or that which, dips; especially, a vessel used to dip water or other liquid; a ladle.

The act or process of immersing.

Doubly prismatic.

A pungent, mobile, volatile liquid, C6H6, produced artificially from certain allyl derivatives. Though isomeric with benzine, it is very different in its chemical relations. Called also dipropinyl.

One of the hexane paraffins, found in petroleum, consisting of two propyl radicals. See Hexane.

An extinct Quaternary marsupial from Australia, about as large as the hippopotamus; -- so named because of its two large front teeth. See Illustration in Appendix.

A serpent whose bite was fabled to produce intense thirst.

Tending to produce thirst.

A morbid an uncontrollable craving (often periodic) for drink, esp. for alcoholic liquors; also improperly used to denote acute and chronic alcoholism.

One who has an irrepressible desire for alcoholic drinks.

Of or pertaining to dipsomania.

Excessive thirst produced by disease.

a graduated rod dipped into a container to indicate the fluid level; as, to check the oil level in a car with a dipstick.

A sinker attached to a fishing line; also, a line having several branches, each with such a sinker, used in deep-sea fishing.

An extensive order of insects having only two functional wings and two balancers, as the house fly, mosquito, etc. They have a suctorial proboscis, often including two pairs of sharp organs (mandibles and maxill/) with which they pierce the skin of animals. They undergo a complete metamorphosis, their larv/ (called maggots) being usually without feet.

Having two wings only; belonging to the order Diptera.

An insect of the order Diptera.

A genus of trees found in the East Indies, some species of which produce a fragrant resin, other species wood oil. The fruit has two long wings.

Having two wings, as certain insects; belonging to the order Diptera.

Having two dorsal fins; -- said of certain fishes.

a genus of tropical American trees which produce a black seed called the tonka bean.

A noun which has only two cases.

Anything consisting of two leaves. A writing tablet consisting of two leaves of rigid material connected by hinges and shutting together so as to protect the writing within. A picture or series of pictures painted on two tablets connected by hinges. See Triptych.

A mineral of the scapolite group; -- so called from the double effect of fire upon it, in fusing it, and rendering it phosphorescent.

Containing two stones or nutlets.

A polymeric form of pyridine, C10H10N2, obtained as a colorless oil by the action of sodium on pyridine.

A crystalline nitrogenous base, C10H8N2, obtained by the reduction of pyridine.

The emission and diffusion of rays of light.

Ill-boding; portentous; as, dire omens.

A character, thus [/], placed at the end of a staff on the line or space of the first note of the next staff, to apprise the performer of its situation.

Acting directly, as one part upon another, without the intervention of other working parts.

Coupled without intermediate connections, as an engine and a dynamo.

having a specified direction; often used in combination; as, goal-directed.

One who directs; a director.

The act of directing, of aiming, regulating, guiding, or ordering; guidance; management; superintendence; administration; as, the direction o/ public affairs or of a bank.

of or pertaining to direction (definition 2).

the property of a microphone or antenna of being more sensitive to signal arriving from one direction than from another.

purposeless. Opposite of purposeful.

Having power to direct; tending to direct, guide, or govern; showing the way.