digestion : Idioms & Phrases
Gastric digestion
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noun the process of breaking down proteins by the action of the gastric juice in the stomach
WordNet
(Physiol.) , the conversion of the albuminous portion of food in the stomach into soluble and diffusible products by the solvent action of gastric juice.
Webster 1913
self-digestion
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noun lysis of plant or animal tissue by an internal process
autolysis.