TET'RAGON, noun [Gr. four, and an angle.] 1. In geometry, a figure having four angles; a quadrangle; as a square, a rhombus, etc. 2. In astrology, an aspect of two planets with regard to the earth, when they are distant from each other ninety degrees, or the fourth of a circle.
Source: Webster's 1828 American Dictionary ↗ · public-domain · returned verbatim, no AI