We found one dictionary that defines the word Trethewy:

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1. Trethewy: Wiktionary

Definitions from Wiktionary (Trethewy) ▸ noun:  A surname. ▸ Words similar to Trethewy ▸ Usage examples for Trethewy ▸ Idioms related to Trethewy ▸ Wikipedia articles (New!) ▸ Popular adjectives describing Trethewy ▸ Words that often appear near Trethewy ▸ Rhymes of Trethewy ▸ Invented words related to Trethewy