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.
Milton.
(b) The act of testing by experience; proof; test.
Repeated trials of the issues and events of actions.
Bp. Wilkins.
(c) Examination by a test; experiment, as in chemistry, metallurgy,
etc.
2. The state of being tried or tempted; exposure to suffering that
tests strength, patience, faith, or the like; affliction or temptation
that exercises and proves the graces or virtues of men.
Others had trial of cruel mockings and scourgings.
Heb. xi. 36.
3. That which tries or afflicts; that which harasses; that which tries
the character or principles; that which tempts to evil; as, his child's
conduct was a sore trial.
Every station is exposed to some trials.
Rogers.
4. (Law) The formal examination of the matter in issue in a cause
before a competent tribunal; the mode of determining a question of fact
in a court of law; the examination, in legal form, of the facts in
issue in a cause pending before a competent tribunal, for the purpose
of determining such issue.
Syn. — Test; attempt; endeavor; effort; experiment; proof; essay. See
Test, and Attempt.
Tri*al"i*ty (?), n. [L. tres, tria, three.] Three united; state of
being three. [R.] H. Wharton.
Tri"a*logue, n. [LL. trialogus; tri- (see Tri-) + -logus as, in L.
dialogus, E. dialogue.] A discourse or colloquy by three persons.
Tri*am"ide (?), n. [tri- + amine.] (Chem.) An amide containing three
amido groups.
Tri*am"ine (?), n. [Pref. tri- + amine.] (Chem.) An amine containing
three amido groups.
Tri"an`der (?), n. (Bot.) Any one of the Triandria.
||Tri*an"dri*a (?), n. pl. [NL. See Tri- , and -androus.] (Bot.) A
||Linnæan class of plants having three distinct and equal stamens.
||
{ Tri*an"dri*an (?), Tri*an"drous (?), } a. [Cf. F. triandre.] (Bot.)
Of or pertaining to the Triandria; having three distinct and equal
stamens in the same flower.
Tri"an`gle (?), n. [L. triangulum, fr. triangulus triangular; tri- (see
Tri-) + angulus angle: cf. F. triangle. See Angle a corner.] 1. (Geom.)
A figure bounded by three lines, and containing three angles.
A triangle is either plane, spherical, or curvilinear, according as its
sides are straight lines, or arcs of great circles of a sphere, or any
curved lines whatever. A plane triangle is designated as scalene,
isosceles, or equilateral, according as it has no two sides equal, two
sides equal, or all sides equal; and also as right-angled, or
oblique-angled, according as it has one right angle, or none; and
oblique-angled triangle is either acute-angled, or obtuse-angled,
according as all the angles are acute, or one of them obtuse. The terms
scalene, isosceles, equilateral, right-angled, acute- angled, and
obtuse-angled, are applied to spherical triangles in the same sense as
to plane triangles.
2. (Mus.) An instrument of percussion, usually made of a rod of steel,
bent into the form of a triangle, open at one angle, and sounded by
being struck with a small metallic rod.