We found one dictionary that defines the word supraperitoneal:

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1. supraperitoneal: Wiktionary

Definitions from Wiktionary (supraperitoneal) ▸ adjective:  Above the peritoneum. ▸ Words similar to supraperitoneal ▸ Usage examples for supraperitoneal ▸ Idioms related to supraperitoneal ▸ Wikipedia articles (New!) ▸ Popular nouns described by supraperitoneal ▸ Words that often appear near supraperitoneal ▸ Rhymes of supraperitoneal ▸ Invented words related to supraperitoneal