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Pronunciation: de'for-ma'shun


  1. Deviation of form from normal; specifically, an alteration in shape and/or structure of an organ or other body part; etiology may be developmental, posttraumatic, hereditary, or postsurgical, or due to pathologic conditions in adjacent structures (compression by a tumor mass).
  2. In rheology, the change in the physical shape of a mass by applied stress.

[L. de-formo, pp. -atus, to deform, fr. forma, form]

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© Copyright 2018 Wolters Kluwer. All Rights Reserved. Review date: Sep 19, 2016.