triangular

Adjective

WordNet 3.0

Adjective (2)

having three angles; forming or shaped like a triangle“a triangular figure”“a triangular pyrimid has a triangle for a base”
having three sides“a trilateral figure”Synonyms: trilateral three-sided

Webster's Dictionary (GCIDE)

Compasses \Com"pass*es\, n., pl. An instrument for describing circles, measuring figures, etc., consisting of two, or (rarely) more, pointed branches, or legs, usually joined at the top by a rivet on which they move. [1913 Webster]

Note: The compasses for drawing circles have adjustable pen points, pencil points, etc.; those used for measuring without adjustable points are generally called dividers. See Dividers. [1913 Webster]

Bow compasses. See Bow-compass.

Caliber compasses, Caliper compasses. See Calipers.

Proportional, Triangular, etc., compasses. See under Proportional, etc. [1913 Webster]

Triangular \Tri*an"gu*lar\, a. [L. triangularis: cf. F. triangulaire.]

1.Having three angles; having the form of a triangle. [1913 Webster]

2.(Bot.) Oblong or elongated, and having three lateral angles; as, a triangular seed, leaf, or stem. [1913 Webster]

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 (Zool.), 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. [1913 Webster]