4. (Mus.) A kind of frame formed of three poles stuck in the ground and
united at the top, to which soldiers were bound when undergoing
corporal punishment, — now disused.
5. (Astron.) (a) A small constellation situated between Aries and
Andromeda. (b) A small constellation near the South Pole, containing
three bright stars.
Triangle spider (Zoöl.), a small American spider (Hyptiotes Americanus)
of the family Ciniflonidæ, living among the dead branches of evergreen
trees. It constructs a triangular web, or net, usually composed of four
radii crossed by a double elastic fiber. The spider holds the thread at
the apex of the web and stretches it tight, but lets go and springs the
net when an insect comes in contact with it.
Tri"an`gled (?), a. Having three angles; triangular.
Tri*an"gu*lar (?), a. [L. triangularis: cf. F. triangulaire.] 1. Having
three angles; having the form of a triangle.
2. (Bot.) Oblong or elongated, and having three lateral angles; as, a
triangular seed, leaf, or stem.
Triangular compasses, compasses with three legs for taking off the
angular points of a triangle, or any three points at the same time. —
Triangular crab (Zoöl.), any maioid crab; — so called because the
carapace is usually triangular. — Triangular numbers (Math.), the
series of numbers formed by the successive sums of the terms of an
arithmetical progression, of which the first term and the common
difference are 1. See Figurate numbers, under Figurate.
||Tri*an`gu*la"res (?), n. pl. [L.] (Zoöl.) The triangular, or maioid,
||crabs. See Illust. under Maioid, and Illust. of Spider crab, under
||Spider.
||
Tri*an`gu*lar"i*ty (?), n. The quality or state of being triangular.
Bolingbroke.
Tri*an"gu*lar*ly (?), adv. In a triangular manner; in the form of a
triangle. Dampier.
Tri*an"gu*late (?), v. t. [imp. & p. p. Triangulated (?); p. pr. & vb.
n. Triangulating.] 1. To divide into triangles; specifically, to survey
by means of a series of triangles properly laid down and measured.