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 trisoctahedron.

(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.

(b) The act of testing by experience; proof; test.

Repeated trials of the issues and events of actions.
Bp. Wilkins.

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.

  By PanEris using Melati.

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