We found one dictionary that defines the word hinge-back tortoise:

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1. hinge-back tortoise: Wiktionary

Definitions from Wiktionary (hinge-back tortoise) ▸ noun:  Synonym of hingeback ▸ Words similar to hinge-back tortoise ▸ Usage examples for hinge-back tortoise ▸ Idioms related to hinge-back tortoise ▸ Wikipedia articles (New!) ▸ Words that often appear near hinge-back tortoise ▸ Rhymes of hinge-back tortoise ▸ Invented words related to hinge-back tortoise