trigonoidadj.n.
/ˈtrɪɡənɔɪd/ Geometry.
A. adj.
Resembling a triangle; approximately triangular.
ΘΚΠ
the world > relative properties > number > geometry > shape or figure > [adjective] > two-dimensional > triangular > approximately
trigonoidal1822
trigonoid1873
1822 [see trigonoidal adj. at Derivatives].
1873 G. Salmon Treat. Higher Plane Curves 245 The quartic is a triacnodal curve composed of a trigonoid figure within the triangle and of the three vertices as acnodes.
B. n.
Categories »
A plane figure contained by three circular arcs of equal radius meeting at angles; a species of curvilinear triangle.
Derivatives
trigoˈnoidal adj. (a) Natural History = A. adj.; (b) Geometry ‘like a trigonoid’ ( Cent. Dict. 1891).
ΘΚΠ
the world > life > biology > physical aspects or shapes > shape > [adjective] > triangular or three-sided
triquetral1646
trigonala1728
triquetrous1752
trigonate1815
obtrigonate1819
trigonous1821
trigonoidal1822
obtriangular1826
obtrigonal1856
the world > relative properties > number > geometry > shape or figure > [adjective] > two-dimensional > triangular > approximately
trigonoidal1822
trigonoid1873
1822 J. Parkinson Outl. Oryctol. 217 Subcordated, trigonoidal.
This entry has not yet been fully updated (first published 1914; most recently modified version published online June 2018).
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adj.n.1822