We found one dictionary that defines the word protochemically:

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1. protochemically: Wiktionary

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