deformation (n.)

mid-15c., deformacioun, "transformation, act of changing the form of," from Old French deformation and directly from Latin deformationem (nominative deformatio), noun of action from past participle stem of deformare "put out of shape, disfigure," from de (see de-) + formare "to shape, fashion, build," also figurative, from forma "form, contour, figure, shape" (see form (n.)). Meaning "deformity, disfigurement, alteration for the worse" is from 1540s.