An archaic or rare shortened form of eupepsia; good digestion or the state of normal healthy digestive function.
A colloquial shortening of eupepsia, dropping the Greek '-ia' ending in favor of a simpler '-y' suffix common in English adjectives and informal terms, likely 19th-century coinage.
This word is so obsolete that even spell-checkers don't recognize it—a perfect example of medical jargon that sounded impressive once but got replaced by simpler terms.
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