Pronunciation: (di-fôrm'),[key] —v.t. 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. Geol.,Mech.to subject to deformation: The metal was deformed under stress.