1. A prefix meaning three, thrice, threefold; as in tricolored, tridentate.
2. (Chem.) A prefix (also used adjectively) denoting three proportional or combining part, or the third
degree of that to the name of which it is prefixed; as in trisulphide, trioxide, trichloride.
(Tri"a*ble) a. [From Try.]
1. Fit or possible to be tried; liable to be subjected to trial or test. "Experiments triable." Boyle.
2. (Law) Liable to undergo a judicial examination; properly coming under the cognizance of a court; as,
a cause may be triable before one court which is not triable in another.
(Tri"a*ble*ness), n. Quality or state of being triable.
(Tri*ac"id) a. [Pref. tri- + acid.] (Chem.) Capable of neutralizing three molecules of a monobasic
acid or the equivalent; having three hydrogen atoms which may be acid radicals; said of certain bases; thus,
glycerin is a triacid base.
(Tri"a*cle) n. See Treacle. [Obs.] Chaucer.
(Tri`a*con`ta*he"dral) a. [Gr. thirty + seat, base.] Having thirty sides.
(Tri"a*con`ter) n. [Gr. fr. thirty.] (Gr. Antiq.) A vessel with thirty banks of oars, or, as some
say, thirty ranks of rowers.
(Tri"ad) n. [L. trias, - adis, Gr. fr. three: cf. F. triade. See Three, and cf. Trias, Trio.]
1. A union of three; three objects treated as one; a ternary; a trinity; as, a triad of deities.
2. (Mus.) (a) A chord of three notes. (b) The common chord, consisting of a tone with its third and
fifth, with or without the octave.
3. (Chem.) An element or radical whose valence is three.
Triads of the Welsh bards, poetical histories, in which the facts recorded are grouped by threes, three
things or circumstances of a kind being mentioned together. Hindu triad. See Trimurti.
(Tri`a*del"phous) a. [Pref. tri- + Gr. brother.] (Bot.) Having stamens joined by filaments
into three bundles. See Illust. under Adelphous.
(Tri*ad"ic) a. (Chem.) Having the characteristics of a triad; as, boron is triadic.
(Tri"a*kis*oc`ta*he"dron) n. [Gr. thrice + E. octahedron.] (Crystalloq.) A trigonal
(Tri"al) n. [From Try.]
1. The act of trying or testing in any manner. Specifically:
(a) Any effort or exertion of strength for the purpose of ascertaining what can be done or effected.
[I] defy thee to the trial of mortal fight.Milton.
(b) The act of testing by experience; proof; test.
Repeated trials of the issues and events of actions.Bp. Wilkins.