We found one dictionary that defines the word Merck's rhino:

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1. Merck's rhino: Wiktionary

Definitions from Wiktionary (Merck's rhino) ▸ noun:  Merck's rhinoceros. ▸ Words similar to Merck's rhino ▸ Usage examples for Merck's rhino ▸ Idioms related to Merck's rhino ▸ Wikipedia articles (New!) ▸ Words that often appear near Merck's rhino ▸ Rhymes of Merck's rhino ▸ Invented words related to Merck's rhino