verb (used with object)

  1. to mar the natural form or shape of; put out of shape; disfigure: In cases where the drug was taken during pregnancy, its effects deformed the infants.
  2. to make ugly, ungraceful, or displeasing; mar the beauty of; spoil: The trees had been completely deformed by the force of the wind.
  3. to change the form of; transform.
  4. Geology, Mechanics. to subject to deformation: The metal was deformed under stress.

verb (used without object)

  1. to undergo deformation.


  1. to make or become misshapen or distorted
  2. (tr) to mar the beauty of; disfigure
  3. (tr) to subject or be subjected to a stress that causes a change of dimensions

c.1400, “to disfigure,” from Old French deformer (13c.), from Latin deformare “put out of shape, disfigure,” from de- (see de-) + formare (see form (v.)). Related: Deformed; deforming.

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