# 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**
*(Zol.)*, 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]

## Tri*an`gu*la"res

(?), n. pl. [L.]*(Zol.)*The triangular, or maioid, crabs. See Illust. under Maioid, and Illust. of

*Spider crab*, under Spider.

[1913 Webster]

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Thu 23rd May 2019