Etymology
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indigestion (n.)

late 14c., "difficulty or inability in digesting food," from Old French indigestion (13c.), from Late Latin indigestionem (nominative indigestio), from in- "not, opposite of" (see in- (1)) + digestionem "arrangement, distribution" (see digestion). An Old English word for it was unmeltung.

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Definitions of indigestion

indigestion (n.)
a disorder of digestive function characterized by discomfort or heartburn or nausea;
Synonyms: dyspepsia / stomach upset / upset stomach
From wordnet.princeton.edu