trigon

/trahy-gon/US // ˈtraɪ gɒn //UK // (ˈtraɪɡɒn) //

三叉戟,三角形,鳟鱼,三角洲

Definitions

n.名词 noun

1
- : a triangle.
- : an ancient Greek stringed instrument with a triangular shape.
- : Astrology Archaic. trine. triplicity.

According to this writer, great conjunctions of Jupiter and Saturn occur "in the fiery trigon," about once in 800 years.
Al trigon, insecto sedente, cum corpore triangulum subhorizontale efficientes, superiores margine externo recto.
Thus we speak of a pentagon but not of a tetragon or a trigon, although both words are correct in form.