Pronunciation: nitch, nesh
- In contrast radiography, an eroded or ulcerated area, especially gastrointestinal or vascular, which can be detected when it fills with contrast medium.
- An ecologic term for the position occupied by a species in a biotic community, particularly its relationships to various other competitor, predator, prey, and parasite species.
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Examples: glitazone, GI cocktail, etc.
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