Where does “15-gon” come from?

15-gon (English) comes from English fifteen, from Middle English fiftene, from Old English fīftīene, from Proto-Germanic fimftehun, from Proto-Germanic tehun, from Proto-Indo-European déḱm̥t — ten.

15-gon (English): A polygon with fifteen sides

Definitions

  1. A polygon with fifteen sides

Ancestry of “15-gon”, step by step

15-gon traces back through two separate lines of ancestry.

via English fifteen

StepLanguageWordMeaning
1EnglishfifteenThe cardinal number occurring after fourteen and...
2Middle Englishfiftenefifteen
3Old Englishfīftīenefifteen
4Proto-Germanicfimftehunfifteen
5Proto-Germanictehunten
6Proto-Indo-Europeandéḱm̥tten

via English gon

StepLanguageWordMeaning
1EnglishgonOne hundredth of a right angle; a gradian;...
2Ancient Greekγωνίαcorner, angle; joiner's square; cornerstone
3Ancient Greekγόνυknee
4Proto-Hellenicgónuknee
5Proto-Indo-Europeanǵónuknee
Every word from Proto-Indo-European déḱm̥t →