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From The Collaborative International Dictionary of English v.0.44 [gcide]:
Compasses \Com"pass*es\, noun, 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.
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}.
{Bow compasses}. See {Bow-compass}.
{Caliber compasses}, {Caliper compasses}. See {Calipers}.
{Proportional}, {Triangular}, etc., {compasses}. See under {Proportional}, etc.
From The Collaborative International Dictionary of English v.0.44 [gcide]:
Triangular \Tri*an"gu*lar\, adjective [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} (Zo["o]l.), 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}.
From WordNet (r) 2.0 [wn]:
triangular
adjective
1: having three angles; forming or shaped like a triangle; "a triangular figure"; "a triangular pyrimid has a triangle for a base"
2: involving three parties or elements; "the triangular mother-father-child relationship"; "a trilateral agreement"; "a tripartite treaty"; "a tripartite division"; "a three-way playoff" [syn: {trilateral}, {tripartite}, {three-party}, {three-way}]
3: having three sides; "a trilateral figure" [syn: {trilateral}, {three-sided}]
From Moby Thesaurus II by Grady Ward, 1.0 [moby-thes]:
44 Moby Thesaurus words for "triangular": cuneate, cuneated, cuneiform, deltoid, fan-shaped, oxygonal, three, three-cornered, three-dimensional, three-footed, three-in-one, three-pronged, three-sided, triadic, trial, triangulate, triarch, trichotomous, tricorn, tricornered, tricuspid, trident, tridental, trifid, triflorate, triflorous, trifurcate, trigonal, trigonoid, trigrammatic, trihedral, trilateral, trimerous, trinal, trine, triparted, tripartite, triple, triplex, tripodic, triquetral, triquetrous, trisected, triune
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