We found one dictionary that defines the word protobiface:

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1. protobiface: Wiktionary

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