Where does “-cosa-” come from?

-cosa- (English) comes from English icosa-, from Ancient Greek εἴκοσι, from Proto-Hellenic ewīkəti, from Proto-Indo-European wídḱm̥ti, from Proto-Indo-European dwidḱómt, from Proto-Indo-European déḱm̥t — ten.

Ancestry of “-cosa-”, step by step

StepLanguageWordMeaning
1Englishicosa-API; twenty
2Ancient Greekεἴκοσιtwenty
3Proto-Hellenicewīkəti—
4Proto-Indo-Europeanwídḱm̥titwenty
5Proto-Indo-Europeandwidḱómt—
6Proto-Indo-Europeandéḱm̥tten

Words derived from “-cosa-”

Every word from Proto-Indo-European déḱm̥t →Every word from Proto-Indo-European dwidḱómt →Every word from Proto-Indo-European wídḱm̥ti →