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1. Chemistry See polymorphism.
2. Biology The occurrence of two or more distinct forms, as of an organism during its life cycle or of cells of a certain type.

ple′o·mor′phic adj.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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Adj.1.pleomorphic - relating to or characterized by pleomorphism
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References in periodicals archive ?
The diagnosis of pleomorphic adenoma is established on the basis of history, physical examination, cytology and histopathology.
The terms of malignant giant cell tumours of soft tissues, giant cell sarcoma, giant cell undifferentiated pleomorphic sarcoma and malignant osteoclastoma are synonyms used for this variant.[sup.3,4]
Pleomorphic adenoma is the most common neoplasm of salivary glands.
Myofibroblastic and fibrohistiocytic tumors, pleomorphic sarcoma, liposarcoma, leiomyosarcoma, rhabdomyomas and rhabdomyosarcomas, vascular tumors, tumors of synovial tissue, nerves, melanocytes, cartilage and osseous tissue, and other miscellaneous tumor types are covered, with most systemic categories divided into chapters on benign, intermediate, and malignant tumors.
Post-operative histopathological findings showed presence of pleomorphic adenoma in 18 (90%) cases and Warthin's tumour in 2 (10%).
We identified a case of pleomorphic post kala-azar dermal leishmaniasis (PKDL) with different types of skin lesions in different stages of development.
Data was reported in patients with triple negative breast cancer, anal squamous cell carcinoma, cutaneous squamous cell carcinoma, undifferentiated pleomorphic sarcoma, and small bowel adenocarcinoma.
[8] Benign tumours, occurring most commonly include pleomorphic adenoma, Warthin's tumour, oncocytoma etc.
Figure 3 shows a high power (400x) view showing lipoblasts, pleomorphic lipoblasts, and mature adipocytes.
Things looked bleak for 29-year-old Ceri Dawson two years ago when he was given the bombshell news that he had pleomorphic soft tissue sarcoma - a rare type of cancer - just days before the birth of his son.
Approximately 80% of tumors arising from this gland are benign, (1) of which pleomorphic adenoma (PA) is the most common histology.