niche (nitch, nesh)

1. In contrast radiography, an eroded or ulcerated area, especially gastrointestinal or vascular, which can be detected when it fills with contrast medium. 2. An ecological term for the position occupied by a species in a biotic community, particularly its relationships to various other competitor, predator, prey, and parasite species. [Fr.]
enamel n. enamel crypt
Haudek's n. an archaic term for the radiographic appearance in profile of contrast material filling a gastric ulcer in the wall of the stomach.


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