We found one dictionary that defines the word tridiurnal:

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1. tridiurnal: Wiktionary

Definitions from Wiktionary (tridiurnal) ▸ adjective:  Of or relating to three days. ▸ Words similar to tridiurnal ▸ Usage examples for tridiurnal ▸ Idioms related to tridiurnal ▸ Wikipedia articles (New!) ▸ Popular nouns described by tridiurnal ▸ Words that often appear near tridiurnal ▸ Rhymes of tridiurnal ▸ Invented words related to tridiurnal