‖n.; pl. Aperçus /plu>. [ F., prop. p. p. of apercevoir to perceive. ] 1. A first view or glance, or the perception or estimation so obtained; an immediate apprehension or insight, appreciative rather than analytic. [ 1913 Webster ]

The main object being to develop the several aperçus or insights which furnish the method of such psychology. W. T. Harris. [ 1913 Webster ]

A series of partial and more or less disparate aperçus or outlooks; each for itself a center of experience. James Ward. [ Webster 1913 Suppl. ]

2. Hence, a brief or detached view; conspectus; sketch. [ Webster 1913 Suppl. ]

a. (Bot.) Having the lid removed; -- said of the capsules of mosses. [ 1913 Webster ]

n. A mathematical object existing in more than three dimensions, analogous to the cube in that each two-dimensional facet of the surface is a square; a generalization of a cube in more than three dimensions. [ PJC ]

{ } a. (Zool.) Having no operculum; -- said of certain gastropod shells. [ 1913 Webster ]

a. Of or pertaining to the interoperculum. -- n. The interopercular bone. [ 1913 Webster ]

‖n.; pl. -la (Anat.) The postero-inferior opercular bone, in fishes. [ 1913 Webster ]

n. pl. See Operculum. [ 1913 Webster ]

a. Of, pertaining to, or like, an operculum. [ 1913 Webster ]

n. (Anat.) The principal opercular bone or operculum of fishes. [ 1913 Webster ]

{ } a. [ L. operculatus, p. p. of operculare to furnish with a lid, fr. operculum lid. ] 1. (Bot.) Closed by a lid or cover, as the capsules of the mosses. [ 1913 Webster ]

2. (Zool.) Having an operculum, or an apparatus for protecting the gills; -- said of shells and of fishes. [ 1913 Webster ]

a. [ Operculum + -ferous. ] (Zool.) Bearing an operculum. [ 1913 Webster ]

a. [ L. operculum a cover + -form: cf. F. operculiforme. ] Having the form of a lid or cover. [ 1913 Webster ]

a. [ Operculum + -genous. ] (Zool.) Producing an operculum; -- said of the foot, or part of the foot, of certain mollusks. [ 1913 Webster ]

n.; pl. L. Opercula E. Operculums [ L., a cover or lid, fr. operire to cover. ] 1. (Bot.) (a) The lid of a pitcherform leaf. (b) The lid of the urnlike capsule of mosses. [ 1913 Webster ]

2. (Anat.) (a) Any lidlike or operculiform process or part; as, the opercula of a dental follicle. (b) The fold of integument, usually supported by bony plates, which protects the gills of most fishes and some amphibians; the gill cover; the gill lid. (c) The principal opercular bone in the upper and posterior part of the gill cover. [ 1913 Webster ]

3. (Zool.) (a) The lid closing the aperture of various species of shells, as the common whelk. See Illust. of Gastropoda. (b) Any lid-shaped structure closing the aperture of a tube or shell. [ 1913 Webster ]

a. [ Prob. corrupt. fr. portcullised. ] (Her.) Latticed. See Lattice, n., 2. [ 1913 Webster ]

a. [ L. percurrens, p. pr. of percurrere to run through; per through + currere to run. ] Running through the entire length. [ 1913 Webster ]

a. [ L. percursor one who runs through, fr. percurrere. See Percurrent. ] Running over slightly or in haste; cursory. [ R. ] [ 1913 Webster ]

v. t. [ imp. & p. p. Percussed p. pr. & vb. n. Percussing. ] [ L. percussus, p. p. of percutere; per + quatere to shake, strike. See Quash. ] To strike smartly; to strike upon or against; as, to percuss the chest in medical examination. [ 1913 Webster ]

Flame percussed by air giveth a noise. Bacon. [ 1913 Webster ]

v. i. (Med.) To strike or tap in an examination by percussion. See Percussion, 3. Quain. [ 1913 Webster ]

n. [ L. percussio: cf. F. percussion. See Percuss. ] 1. The act of percussing, or striking one body against another; forcible collision, esp. such as gives a sound or report. Sir I. Newton. [ 1913 Webster ]

2. Hence: The effect of violent collision; vibratory shock; impression of sound on the ear. [ 1913 Webster ]

The thunderlike percussion of thy sounds. Shak. [ 1913 Webster ]

3. (Med.) The act of tapping or striking the surface of the body in order to learn the condition of the parts beneath by the sound emitted or the sensation imparted to the fingers. Percussion is said to be immediate if the blow is directly upon the body; if some intervening substance, as a pleximeter, is, used, it is called mediate. [ 1913 Webster ]

Center of percussion. See under Center. --
Percussion bullet, a bullet containing a substance which is exploded by percussion; an explosive bullet. --
Percussion cap, a small copper cap or cup, containing fulminating powder, and used with a percussion lock to explode gunpowder. --
Percussion fuze. See under Fuze. --
Percussion lock, the lock of a gun that is fired by percussion upon fulminating powder. --
Percussion match, a match which ignites by percussion. --
Percussion powder, powder so composed as to ignite by slight percussion; fulminating powder. --
Percussion sieve,
Percussion table, a machine for sorting ores by agitation in running water. [ 1913 Webster ]

n. A musical instrument which is played by striking, as a drum, cymbal, or xylophone. [ PJC ]

n. A musician who plays percussion instruments. [ WordNet 1.5 ]

The world-renowned deaf percussionist Evelyn Glennie prefers to be thought of as a percussionist who happens to be deaf. [ PJC ]

a. Striking against; percutient; as, percussive force. [ 1913 Webster ]

a. [ L. percutiens, p. pr. of percutere. See Percuss. ] Striking; having the power of striking. -- n. That which strikes, or has power to strike. Bacon. [ 1913 Webster ]

n. [ NL. ] (Anat.) Same as Preoperculum. -- Præ`o*per"cu*lar, a. [1913 Webster]

a. (Anat.) Situated in front of the operculum; pertaining to the preoperculum. -- n. The preoperculum. [ 1913 Webster ]

‖n. [ NL. ] (Anat.) The anterior opercular bone in fishes. [ 1913 Webster ]

v. t. [ imp. & p. p. Repercussed p. pr. & vb. n. Repercussing. ] [ L. repercusus, p. p. of repercutere to drive back; pref. re- re- + percutere. See Percussion. ] To drive or beat back; hence, to reflect; to reverberate. [ 1913 Webster ]

Perceiving all the subjacent country, . . . to repercuss such a light as I could hardly look against. Evelyn. [ 1913 Webster ]

n. [ L. repercussio: cf. F. répercussion. ] 1. The act of driving back, or the state of being driven back; reflection; reverberation; as, the repercussion of sound. [ 1913 Webster ]

Ever echoing back in endless repercussion. Hare. [ 1913 Webster ]

2. (Mus.) Rapid reiteration of the same sound. [ 1913 Webster ]

3. (Med.) The subsidence of a tumor or eruption by the action of a repellent. Dunglison. [ 1913 Webster ]

4. (Obstetrics) In a vaginal examination, the act of imparting through the uterine wall with the finger a shock to the fetus, so that it bounds upward, and falls back again against the examining finger. [ 1913 Webster ]

a. [ Cf. F. répercussif. ] [ 1913 Webster ]

1. Tending or able to repercuss; having the power of sending back; causing to reverberate. [ 1913 Webster ]

Ye repercussive rocks! repeat the sound. W. Pattison. [ 1913 Webster ]

2. Repellent. [ Obs. ] “Blood is stanched by astringent and repercussive medicines.” Bacon. [ 1913 Webster ]

3. Driven back; rebounding; reverberated. “Rages loud the repercussive roar.” Thomson. [ 1913 Webster ]

n. A repellent. [ Obs. ] Bacon. [ 1913 Webster ]

a. (Anat.) Situated below the operculum; pertaining to the suboperculum. -- n. The suboperculum. [ 1913 Webster ]

n. [ NL. See Sub-, Operculum. ] (Anat.) The lower opercular bone in fishes. [ 1913 Webster ]

a. Excessively curious or inquisitive. Evelyn. [ 1913 Webster ]

a. Destitute of an operculum, or cover. [ 1913 Webster ]