We found one dictionary that defines the word transhistorically:

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1. transhistorically: Wiktionary

Definitions from Wiktionary (transhistorically) ▸ adverb:  In a transhistorical manner. ▸ Words similar to transhistorically ▸ Usage examples for transhistorically ▸ Idioms related to transhistorically ▸ Wikipedia articles (New!) ▸ Words that often appear near transhistorically ▸ Rhymes of transhistorically ▸ Invented words related to transhistorically