tetragon Meaning, Definition & Usage

  1. noun a four-sided polygon
    quadrangle; quadrilateral.

WordNet

Tet"ra*gon noun
Etymology
L. tetragonum, Gr. (see Tetra-) + corner, angle: cf. F. tétragone.
Definitions
  1. (Geom.) A plane figure having four sides and angles; a quadrangle, as a square, a rhombus, etc.
  2. (Astrol.) 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.

Webster 1913