Etymology

trigonal

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Today it means: Having three angles and three sides, triangular. Full definition →

Latin trigōnālis
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The story

  1. Latin · borrowed fromtrigōnālis“triangular”
  2. English todaytrigonal

From Latin trigōnālis (“triangular”), equivalent to trigon + -al.

Etymology from Wiktionary, CC BY-SA 4.0.