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Medical Term:


Pronunciation: 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 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.


© Copyright 2016 Wolters Kluwer. All Rights Reserved. Review Date: Sep 19, 2016.