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The tendency of certain plant organs, as leaves, to assume special "sleeping" positions or make curvatures under the influence of darkness. It is well illustrated in the leaflets of clover and other leguminous plants.

An oarlike swimming organ of various invertebrates. Oar cock (Zoöl), the water rail. [Prov. Eng.] -- Spoon oar, an oar having the blade so curved as to afford a better hold upon the water in rowing. -- To boat the oars, to cease rowing, and lay the oars in the boat. -- To feather the oars. See under Feather., v. t.…

An anthem chanted, or a voluntary played on the organ, during the offering and first part of the Mass.

The sense by which the impressions made on the olfactory organs by the odorous particles in the atmosphere are perceived.

A smelling organ; a nose. [R.]

nected with, the sense of smell; as, the olfactory nerves; the olfactory cells. Olfactory organ (Anat.), an organ for smelling. In vertebrates the olfactory organs are more or less complicated sacs, situated in the front part of the head and lined with epithelium innervated by the olfactory (or first cranial) nerves, a…

Having few members in each set of organs; as, an oligomerous flower.

An instrument for measuring the variations in size of the internal organs of the body, as the kidney, spleen, etc.

The history of the individual development of an organism; the history of the evolution of the germ; the development of an individual organism, -- in distinction from phylogeny, or evolution of the tribe. Called also henogenesis, henogeny.

Uttered with a relatively wide opening of the articulating organs; -- said of vowels; as, the än fär is open as compared with the a in say.

An eyestalk; the organ which bears the compound eyes of decapod Crustacea.

Of, pertaining to, or designating, an organic acid obtained by the oxidation of narcotine.

A division of gastropod Mollusca, in which the breathing organs are usually situated behind the heart. It includes the tectibranchs and nudibranchs.

See Army organization, above.

Placed directly in front of another part or organ, as a stamen which stands before a petal.

The organ of sight; an eye. The difference is as great between The optics seeing, as the object seen. Pope.

One of a secret society, organized in the north of Ireland in 1795, the professed objects of which are the defense of the regning sovereign of Great Britain, the support of the Protestant religion, the maintenance of the laws of the kingdom, etc.; -- so called in honor of William, Prince of Orange, who became William I…

Eager or immoderate excitement or action; the state of turgescence of any organ; erethism; esp., the height of venereal excitement in sexual intercourse.

See Organling.

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.