tetragon

Etymology

tetra- + -gon.

noun

  1. (geometry, rare) Quadrilateral.
  2. An aspect of two planets with regard to the Earth when they are distant from each other ninety degrees, or a quarter-circle.
    In the horoscope of Christ's nativity.[…]Whether a trigon or no, this tetragon I am sure there was. a. 1626, Bishop Andrewes, Sermon

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