Tetragon

//ˈtɛ.tɹə.ɡɒn// noun

Definitions

Noun
  1. 1
    Quadrilateral. rare
  2. 2
    a four-sided polygon wordnet
  3. 3
    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."

Etymology

From tetra- + -gon.

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