Webster
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Webster’s Revised Unabridged Dictionary · 1913

Triangular

Tri·an′gu·lar (trī·ăn̲′gū·lẽr), 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.

Webster’s Revised Unabridged Dictionary, Noah Porter, editor (Springfield, Mass.: G. & C. Merriam, 1913). Public domain. Text as transcribed by MICRA, Inc., from Project Gutenberg. Changed for Deep Dive Bible: Greek, which our source spelled in Latin letters, set in Greek letters; entries of one spelling merged into one article; Greek words our source left out (shown as “?”), read from the 1898 printing, from the same plates (the Library of Congress’s copy), where the place could be found with certainty. Of the others, 1,362 (a word or a single letter each) were inferred by AI from the context by the dictionary’s own rules and are marked with a wavy underline (tap or point at one to see the note); the rest, which could not be inferred with confidence, are left as “?”.