(1):

(n.) A distorted or monstrous projection or representation of an image on a plane or curved surface, which, when viewed from a certain point, or as reflected from a curved mirror or through a polyhedron, appears regular and in proportion; a deformation of an image.

(2):

(n.) Same as Anamorphism, 2.

(3):

(n.) A morbid or monstrous development, or change of form, or degeneration.