† orthogoniumn.

Forms: 1500s orthigonium, 1600s orthogonium.

Origin: A borrowing from Latin. Etymon: Latin orthogonium.

Etymology: < post-classical Latin orthogonium right-angled triangle (a636 in Isidore), use as noun of neuter singular of classical Latin orthogōnius right-angled (Vitruvius) < ancient Greek ὀρθογώνιος (see orthogonion n.).

Obsolete.

A right-angled triangle.

ΘΚΠ

the world > space > shape > angularity > specific angular shape > [noun] > triangle > specific

orthogonium1570

right triangle1583

orthogonion1653

1570 H. Billingsley tr. Euclid Elements Geom. i. f. 4^v An Orthigonium or a rightangled triangle, is a triangle which hath a right angle.

1612 H. Peacham Gentlemans Exercise 17 The square will make you ready for all manner of compartments..your Cylinder for valted turrets, and round buildings; your Orthogonium and Pyramis, for sharp steeples.

1690 W. Leybourn Cursus mathematicus 208 Every Triangle [which] containeth..One Right Angle and two Acute Angles..is called Orthogonium.

This is a new entry (OED Third Edition, September 2004; most recently modified version published online December 2020).

单词	orthogonium
释义	† orthogoniumn. Forms: 1500s orthigonium, 1600s orthogonium. Origin: A borrowing from Latin. Etymon: Latin orthogonium. Etymology: < post-classical Latin orthogonium right-angled triangle (a636 in Isidore), use as noun of neuter singular of classical Latin orthogōnius right-angled (Vitruvius) < ancient Greek ὀρθογώνιος (see orthogonion n.). Obsolete. A right-angled triangle. ΘΚΠ the world > space > shape > angularity > specific angular shape > [noun] > triangle > specific orthogonium1570 right triangle1583 orthogonion1653 1570 H. Billingsley tr. Euclid Elements Geom. i. f. 4^v An Orthigonium or a rightangled triangle, is a triangle which hath a right angle. 1612 H. Peacham Gentlemans Exercise 17 The square will make you ready for all manner of compartments..your Cylinder for valted turrets, and round buildings; your Orthogonium and Pyramis, for sharp steeples. 1690 W. Leybourn Cursus mathematicus 208 Every Triangle [which] containeth..One Right Angle and two Acute Angles..is called Orthogonium. This is a new entry (OED Third Edition, September 2004; most recently modified version published online December 2020). < n.1570
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