Where does “pseudotriangle” come from?

pseudotriangle (English) comes from English triangle, from Middle English triangle, from Old French triangle, from Latin triangulum, from Latin triangulus, from Latin Angulus, from Proto-Indo-European h₂engulos, from Proto-Indo-European h₂eng- — curve, bend.

pseudotriangle (English): Any subset of a plane that lies between any three...

Definitions

  1. Any subset of a plane that lies between any three...

Ancestry of “pseudotriangle”, step by step

pseudotriangle traces back through two separate lines of ancestry.

via English triangle

StepLanguageWordMeaning
1EnglishtriangleA polygon with three sides and three angles; A...
2Middle Englishtriangle
3Old Frenchtriangle
4Latintriangulumtriangle; nominative neuter singular of...
5Latintriangulustriangular, three-cornered, three-sided;...
6LatinAngulusA city of the Vestini, situated on a hill near the Adriatic Sea, now the town of Città Sant'Angelo
7Proto-Indo-Europeanh₂engulosjoint?
8Proto-Indo-Europeanh₂eng-curve, bend

via English pseudo

StepLanguageWordMeaning
1EnglishpseudoAn intellectually pretentious person; a...
2Englishpseudo-False, not genuine, fake
3Ancient Greekψευδήςlying, false, untrue; deceived, beguiled
4Ancient Greek-ήςadjective suffix
5Proto-Indo-European-ēsPrimarily forms adjectival bahuvrīhi compounds
6Proto-Indo-European-ess
7Proto-Indo-European-osCreates action nouns or result nouns from verbs;...
Every word from Proto-Indo-European h₂eng-