Where does “triangle wave” come from?

triangle wave (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.

triangle wave (English): A function or waveform that alternately ramps...

Definitions

  1. A function or waveform that alternately ramps...

Ancestry of “triangle wave”, step by step

triangle wave 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 wave

StepLanguageWordMeaning
1EnglishwaveTo move back and forth repeatedly and somewhat...
2Middle EnglishwaweA wave; Any sort of flowing or spurting motion;...
3Old Englishwǣġa weight; a tool for weighing, balance, scale
4Proto-Germanicwēgazwave; sea
5Proto-Indo-Europeanweǵʰ-to bring; to transport
Every word from Proto-Indo-European h₂eng-Every word from Proto-Indo-European h₂engulosEvery word from Latin Angulus