Acridity; pungency joined with heat.

Sharpness; keenness.

Communicated orally; oral; -- applied to the esoteric teachings of Aristotle, those intended for his genuine disciples, in distinction from his exoteric doctrines, which were adapted to outsiders or the public generally. Hence: Abstruse; profound.

Same as Acroamatic.

One who practices rope dancing, high vaulting, or other daring gymnastic feats.

a genus of mammals.

Pertaining to an acrobat.

Feats of the acrobat; daring gymnastic feats; high vaulting.

Having a terminal fructification; having the fruit at the end of the stalk. Having the fruit stalks at the end of a leafy stem, as in certain mosses.

having a subterminal centromere

Characterized by a high skull.

a genus of birds.

Loftiness of skull.

Of or pertaining to the high mountain range of /thunder-smitten/ peaks (now Kimara), between Epirus and Macedonia.

a genus of herbs and shrubs of Australia and Southern Africa, with an everlasting flower; most species are usually placed in genus Helipterum.

a genus of Central and South American feather palms.

The upper surface of the toes, individually.

One of a group of lizards having the teeth immovably united to the top of the alveolar ridge. Of or pertaining to the acrodonts.

A plant of the highest class of cryptogams, including the ferns, etc. See Cryptogamia.

pertaining to acrogens, flowerless plants (ferns or mosses) in which growth occurs only at the tip of the main stem.

Increasing by growth from the extremity; as, an acrogenous plant.

A limpid, colorless, highly volatile liquid, obtained by the dehydration of glycerin, or the destructive distillation of neutral fats containing glycerin. Its vapors are intensely irritating.

A statue whose extremities are of stone, the trunk being generally of wood.

Pertaining to, or like, an acrolith.

Chronic enlargement of many bones of the skeleton, especially bones of hands, feet and face; the condition is due to excessive secretion of growth hormone.

Of or pertaining to the acromion.

The outer extremity of the shoulder blade.

Having each verse begin with the same letter as that with which the preceding verse ends.

In an acronycal manner as rising at the setting of the sun, and vice versa.

Rising at sunset and setting at sunrise, as a star; -- opposed to cosmical.

Acronycal.

Crookedly.

Developing from below towards the apex, or from the circumference towards the center; centripetal; -- said of certain inflorescence.

The use of a picture symbol of an object to represent phonetically the initial sound of the name of the object.

The entire upper surface of the foot.

The upper part, or the citadel, of a Grecian city; especially, the citadel of Athens.

Pertaining to an acropolis.

To put forth the first sprout.

A spore borne at the extremity of the cells of fructification in fungi.

Having acrospores.

From side to side; crosswise; as, with arms folded across.

broad in scope or content

A composition, usually in verse, in which the first or the last letters of the lines, or certain other letters, taken in order, form a name, word, phrase, or motto.

Pertaining to, or characterized by, acrostics.

After the manner of an acrostic.

The instep or front of the tarsus.

The end of a verse or psalm, or something added thereto, to be sung by the people, by way of a response.

Same as Acroterium.

Pertaining to an acroterium; as, acroterial ornaments.

One of the small pedestals, for statues or other ornaments, placed on the apex and at the basal angles of a pediment. Acroteria are also sometimes placed upon the gables in Gothic architecture. One of the pedestals, for vases or statues, forming a part roof balustrade.

Pertaining to or affecting the surface of the body.

Lack or defect of pulsation.

Having a cleavage parallel with the base.

Of or containing acryl, the hypothetical radical (R.CH:CH.CO-) of which acrolein (H2C:CH.CHO) is the hydride; as, acrylic acid. The characteristic residue in an acrylic compound is the carbonyl group attached directly to an ethylenic carbon.

A paint in which the pigment is suspended in a solution of an acrylic resin, which dries to a hard film on exposure to air.

a thermoplastic made by polymerization of acrylic acid or methacrylic acid or some derivative of these (such as the esters or amides). It can be formed into a clear hard plastic, and is the basis for the commercial plastics called Lucite and Plexiglass.

a colorless liquid compound (H2C:CH.CN); used as raw material for acrylic fibers, and as a solvent.

To exert power; to produce an effect; as, the stomach acts upon food.

Capable of being acted.

baneberry.

luna moths.

Pertaining to the part of a radiate animal which contains the mouth.

An order of Anthozoa, including those which have simple tentacles and do not form stony corals. Sometimes, in a wider sense, applied to all the Anthozoa, expert the Alcyonaria, whether forming corals or not.

Operating in any way.

An animal of the class Anthozoa, and family Actinid/. From a resemblance to flowers in form and color, they are often called animal flowers and sea anemones. [See Polyp.]. A genus in the family Actinid/.

any sea anemone or related animal.

the order comprising sea anemones.

any sea anemone or related animal.

Of or pertaining to actinism; as, actinic rays.

a small Asiatic woody vine bearing many-seeded fruit.

tropical trees or shrubs or woody vines.

Having a radiated form, like a sea anemone.

a genus of terrestrial ferns of tropical Asia and Africa.

The property of radiant energy (found chiefly in solar or electric light) by which chemical changes are produced, as in photography.

A supposed metal, said by Phipson to be contained in commercial zinc; -- so called because certain of its compounds are darkened by exposure to light.

Chemistry in its relations to actinism.

A record made by the actinograph.

An instrument for measuring and recording the variations in the actinic or chemical force of rays of light.

Having the form of rays; radiated, as an actinia.

A bright green variety of amphibole occurring usually in fibrous or columnar masses.

Of the nature of, or containing, actinolite.

The science which treats of rays of light, especially of the actinic or chemical rays.

One of the radial segments composing the body of one of the C/lenterata.

An instrument for measuring the direct heating power of the sun's rays. An instrument for measuring the actinic effect of rays of light.

Pertaining to the measurement of the intensity of the solar rays, either (a) heating, or (b) actinic.

The measurement of the force of solar radiation.

filamentous or rod-shaped bacteria.

branched gram-positive bacteria, often found in soil, some of which are pathogenic for humans and animals.

of or pertaining to actinomycetes.

any of various red antibiotics isolated from soil bacteria with a three-ring heterocyclic nucleus with an attached peptide chain.

The most well-known of the actinomycins (C62H86N12O16), a class of antibiotics which act by binding to DNA and inhibiting synthesis of RNA; they act agains gram-positive bacteria and many eukaryotic organisma. Actinomycin D has been used in human medicine to treat certain tumors.

A chronic infectious disease of cattle and man due to infection with actinomycetes, especially by Actinomyces bovis in cattle and by Actinomyces israeli or Arachnia propionica in man. It is characterized by hard swellings usually in the mouth and jaw. In man the disease may also affect the abdomen or thorax. In cattle it is called also lumpy jaw or big jaw.

Of or pertaining to actinomycosis.

an order comprising parasites of worms.

a type of parasite of worms.

An apparatus for the production of sound by the action of the actinic, or ultraviolet, rays.

Pertaining to, or causing the production of, sound by means of the actinic, or ultraviolet, rays; as, actinophonic phenomena.

Having straight projecting spines.

protozoa having stiff rodlike radiating pseudopods.

heliozoans; radiolarians.

The entire body of a c/lenterate.

One of the bones at the base of a paired fin of a fish.

The mouth or anterior opening of a c/lenterate animal.

A peculiar larval form of Phoronis, a genus of marine worms, having a circle of ciliated tentacles.

A group of C/lenterata, comprising the Anthozoa and Ctenophora. The sea anemone, or actinia, is a familiar example.

Of or pertaining to the Actinozoa.

One of the Actinozoa.

A kind of embryo of certain hydroids (Tubularia), having a stellate form.

A process or condition of acting or moving, as opposed to rest; the doing of something; exertion of power or force, as when one body acts on another; the effect of power exerted on one body by another; agency; activity; operation; as, the action of heat; a man of action.

That may be the subject of an action or suit at law; as, to call a man a thief is actionable.

In an actionable manner.

A shareholder in joint-stock company.

Void of action.

naval battle where Antony and Cleopatra were defeated by Octavian's fleet under Agrippa in 31 BC.

To make active.

treated with aeration and bacteria to aid decomposition; -- of sewage

same as activation{1}.

the process of making active. making active and effective (as a bomb).

any agency bringing about activation; (Biol.) a molecule that increases the activity of an enzyme or a protein that increases the production of a gene product in DNA transcription.

Having the power or quality of acting; causing change; communicating action or motion; acting; -- opposed to passive, that receives; as, certain active principles; the powers of the mind.