Where does “thretty” come from?

thretty (Middle English) comes from Old English þritiġ, from Proto-Germanic þrīz tigiwiz — thirty.

Ancestry of “thretty”, step by step

StepLanguageWordMeaning
1Old Englishþritiġthirty
2Proto-Germanicþrīz tigiwizthirty

Words derived from “thretty

Every word from Proto-Germanic þrīz tigiwizEvery word from Old English þritiġ