| 单词 | triangulo- | 
| 释义 | triangulo-comb. form  used as combining form of Latin triangulum triangle n., in   triangulo-pyramidal adj.,   triangulo-triangular adj. applied to certain series of figurate numbers: see quots., and cf. pyramidal adj. 4, triangular adj. 2b. ΚΠ 1715    Philos. Trans. 1714–16 		(Royal Soc.)	 29 183  				A series of Fractions..whose Numerator is a given Number and Denominators are triangular or pyramidal or triangulo-triangular Numbers, &c. 1785    C. Hutton Math. Tables 7  				The several orders of figurate numbers, which he [Vieta] calls triangular, pyramidal, triangulo-triangular, triangulo-pyramidal. This entry has not yet been fully updated (first published 1914; most recently modified version published online March 2022). < | 
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