See Orach.

An apparatus which illustrates, by the revolution of balls moved by wheelwork, the relative size, periodic motions, positions, orbits, etc., of bodies in the solar system.

A sort of gold or silver lace.

Leaf metal of bronze; Dutch metal. See under Dutch.

See Archil.

Pertaining to, or designating, an acid found in certain lichens, and called also lecanoric acid.

Pertaining to, or designating, an organic acid obtained by a partial decomposition of orsellic acid as a white crystalline substance, and related to protocatechuic acid.

A morsel left at a meal; a fragment; refuse; -- commonly used in the plural.

Any one of numerous small two-winged flies of the family Ortalidae. The larvae of many of these flies live in fruit; those of others produce galls on various plants.

A brachiopod shell of the genus Orthis, and allied genera, of the family Orthidae.

An extinct genus of Brachiopoda, abundant in the Paleozoic rocks.

A variety of allanite occurring in slender prismatic crystals.

Designating a complex ether, C.(OC2H5)4, which is obtained as a liquid of a pleasant ethereal odor by means of chlorpicrin, and is believed to be a derivative of the hypothetical normal carbonic acid, C.(OH)4.

That point in which the three perpendiculars let fall from the angles of a triangle upon the opposite sides, or the sides produced, mutually intersect.

An extinct genus of Paleozoic Cephalopoda, having a long, straight, conical shell. The interior is divided into numerous chambers by transverse septa.

An orthoceras; also, any fossil shell allied to Orthoceras.

Common or potash feldspar crystallizing in the monoclinic system and having two cleavages at right angles to each other. See Feldspar.

Breaking in directions at right angles to each other; -- said of the monoclinic feldspars.

The diagonal or lateral axis in a monoclinic crystal which is at right angles with the vertical axis.

See the Note under Dome, 4.

The treatment of the teeth so as to make the teeth align properly within the mouth, usually involving the wearing of braces and sometimes oral surgery.

Of or pertaining to orthodontics or orthodontia.

A branch of dentistry specializing in the treatment of the teeth so as to make the teeth align properly within the mouth; it usually involves fitting a patient with braces and sometimes oral surgery.

a dentist specializing in the prevention or correction of irregularities of the teeth; one specializing in orthodontics.

Sound in opinion or doctrine, especially in religious doctrine; hence, holding the Christian faith; believing the doctrines taught in the Scriptures; -- opposed to heretical and heterodox; as, an orthodox Christian.

Pertaining to, or evincing, orthodoxy; orthodox.

Orthodoxness.

Orthodoxly.

Orthodox.

Pertaining to, or evincing, orthodoxy; orthodox.

In an orthodox manner; with soundness of faith.

The quality or state of being orthodox; orthodoxy.

Soundness of faith; a belief in the doctrines taught in the Scriptures, or in some established standard of faith; -- opposed to heterodoxy or to heresy.

Of or pertaining to orthodromy.

The art of sailing in a direct course, or on the arc of a great circle, which is the shortest distance between any two points on the surface of the globe; great-circle sailing; orthodromy.

The act or art of sailing on a great circle.

Of or pertaining to orthoepy, or correct pronunciation.

One who is skilled in orthoepy.

The art of uttering words correctly; a correct pronunciation of words; also, mode of pronunciation.

Direct fertilization in plants, as when the pollen fertilizing the ovules comes from the stamens of the same blossom; -- opposed to heterogamy.

Orthognathous.

The quality or state of being orthognathous.

Having the front of the head, or the skull, nearly perpendicular, not retreating backwards above the jaws; -- opposed to prognathous. See Gnathic index, under Gnathic.

A rectangular figure.

Right-angled; rectangular; as, an orthogonal intersection of one curve with another.

Perpendicularly; at right angles; as, a curve cuts a set of curves orthogonally.

An orthographic projection, sometimes partly in section, esp. of a building.

One versed in orthography; one who spells words correctly.

Of or pertaining to orthography, or right spelling; also, correct in spelling; as, orthographical rules; the letter was orthographic.

In an orthographical manner according to the rules of proper spelling according to orthographic projection.

One who spells words correctly; an orthographer.

To spell correctly or according to usage; to correct in regard to spelling.

The right description of things.

Having the axes at right angles to one another; -- said of crystals or crystalline forms.

The art or practice of constructing verses correctly; the laws of correct versification.

Having the right form.

Of, pertaining to, or employed in, orthopedics; relating to the prevention or cure of deformities of children, or, in general, of the human body at any age; as, orthopedic surgery; an orthopedic hospital.

The art or practice of correcting disorders or deformities of the spine and joints, or, by extension, any deformities of the human body.

One who prevents, cures, or remedies deformities, esp. in children.

Same as orthopedics.

A name given to the two planes in the monoclinic system which are parallel to the vertical and orthodiagonal axes.

Specifically, a morbid condition in which respiration can be performed only in an erect posture; by extension, any difficulty of breathing.

An orthopedist.

An extinct order of reptiles which stood erect on the hind legs, and resembled birds in the structure of the feet, pelvis, and other parts.

The treatment of deformities in the human body by mechanical appliances.

An order of mandibulate insects including grasshoppers, locusts, cockroaches, mantids, crickets, katydids, etc. See Illust. under Insect.

One of the Orthoptera.

Of or pertaining to the Orthoptera.

Noting the system of crystallization which has three unequal axes at right angles to each other; trimetric. See Crystallization.

An instrument designed to show the condition of the superficial portions of the eye.

Giving an image in correct or normal proportions; giving a flat field of view; as, an orthoscopic eyepiece.

Designating the form of silicic acid having the normal or highest number of hydroxyl groups.

Having the seeds straight, as in the fruits of some umbelliferous plants; -- opposed to coelospermous.

A chiton, or loose, ungirded tunic, falling in straight folds.

A longitudinal rank, or row, of leaves along a stem.

Cutting at right angles.

Having two cleavages at right angles with one another.

The property of cutting at right angles.

Retaining the accent; not enclitic; -- said of certain indefinite pronouns and adverbs when used interrogatively, which, when not so used, are ordinarilly enclitic.

Having the longer axis vertical; -- said of erect stems.

Having the axis of an ovule or seed straight from the hilum and chalaza to the orifice or the micropyle; atropous.

That variety of xylene (C6H4(CH3)2) in which the two methyl groups are in the ortho position; a colorless, liquid, combustible hydrocarbon resembling benzene.

Of or relating to the time or act of rising; eastern; as, the ortive amplitude of a planet.

A European singing bird (Emberiza hortulana), about the size of the lark, with black wings. It is esteemed delicious food when fattened. Called also bunting. In England, the wheatear (Saxicola oenanthe). In America, the sora, or Carolina rail (Porzana Carolina). See Sora.

One of several species of East Indian birds of the genera Ortygis and Hemipodius. They resemble quails, but lack the hind toe. See Turnix.

A kind of sage (Salvia Horminum).

The blindworm.

A kind of antidote for poisons; a counter poison formerly in vogue.

See Oriel.

The aard-vark (Orycteropus afer).

Same as Oryctere (the aardvark, Orycteropus afer).

Mineralogy.

Description of fossils.

Of or pertaining to oryctology.

One versed in oryctology.

An old name for paleontology.

A genus of African antelopes which includes the gemsbok, the leucoryx, the bisa antelope (Oryx beisa), and the beatrix antelope (Oryx beatrix) of Arabia.

A genus of grasses including the rice plant; rice.

A genus of rodents including the rice rats.

A genus of grasses incluiding rice grass.

Pasta shaped like pearls of barley; frequently prepared with lamb in Greek cuisine.

The chemical symbol for the element osmium.

A member of the Osages, a tribe of North American Indians formerly living in western Missouri.

A tribe of southern Sioux Indians, now living in the Indian Territory.

Hosanna.

See 3d Os.

Of or pertaining to the Osci, a primitive people of Campania, a province of ancient Italy. The language of the Osci.

The state of oscillating; a seesaw kind of motion.

A genus of dark green, or purplish black, filamentous, fresh-water algae, the threads of which have an automatic swaying or crawling motion. Called also Oscillatoria.

That oscillates; vibrating; swinging.

Tending to oscillate; vibratory.

One that oscillates Any device or circuit for producing electric oscillations, whether of current or voltage; esp., an apparatus for generating electric waves in a system of wireless telegraphy.

Same as Oscillaria.

Moving, or characterized by motion, backward and forward like a pendulum; swinging; oscillating; vibratory; as, oscillatory motion.

An autographic record made by an oscillograph.

a device for making a record of the wave forms of fluctuating .

An apparatus for recording or indicating alternating-current wave forms or other electrical oscillations, especially of voltages or currents; it usually consists of a galvanometer with strong field, in which the mass of the moving part is very small and frequency of vibration very high.

An instrument for measuring the angle through which a ship rolls or pitches at sea.

An electronic measuring instrument which provides a visual representation of the time variation of electrical quantities, such as voltage or current. It may be used to measure the shape of a voltage pulse or the frequency of an oscillating voltage. It can also be used to measure properties of other physical variables, such as sound or light intensity, if they can be translated into electrical voltage or current.

Relating to the Oscines.