We found one dictionary that defines the word tribulin:

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1. tribulin: Wiktionary

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