We found one dictionary that defines the word preprothrombin:

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1. preprothrombin: Wiktionary

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