noun Biology.
existence of an organism in two or more distinct forms during the life cycle; polymorphism.
Also, pleomorphy.

1860–65; pleo- + -morph + -ism Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
pleomorphism or pleomorphy (ˌpliːəˈmɔːˌfɪzəm, ˈpliːəˌmɔːfɪ)
1.  the occurrence of more than one different form in the life cycle of a plant or animal
2.  the occurrence of more than one different form of crystal of one chemical compound; polymorphism
pleomorphy or pleomorphy
pleo'morphic or pleomorphy

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

pleomorphism ple·o·mor·phism (plē'ə-môr'fĭz'əm)

  1. See polymorphism.

  2. The occurrence of two or more structural forms during a life cycle, especially of certain plants.

ple'o·mor'phic (-fĭk) or ple'o·mor'phous (-fəs) adj.
The American Heritage® Stedman's Medical Dictionary
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