We found one dictionary that defines the word retrogastric:

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1. retrogastric: Wiktionary

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