Category:Tetragon

Tet"ra*gon, n. Etym: [l. tetragonum, gr. Tetra-) + tétragone.]

1. (geom.)

Defn: a plane figure having four sides and angles; a quadrangle, as a Square, a rhombus, etc.

2. (astrol.)

Defn: 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. Hutton.