(1) The occurrence of two or more structural forms in the life cycle of certain organisms, especially of plants.

(2) Variable appearance; ability to change cell size and shape.


Pleomorphism is exhibited by certain tumors, such as pleomorphic adenoma.

Word origin: Greek pleíōn (more) + morph (form) + -ism.
Related forms: pleomorphic (adjective).

Compare: polymorphism.

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