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polydactyly

or pol·y·dac·tyl·ism

[pol-ee-dak-tuh-lee]
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noun Pathology.
  1. the condition of being polydactyl.
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Origin of polydactyly

First recorded in 1885–90; polydactyl + -y3
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
polydactyly in Medicine

polydactyly

(pŏl′ē-dăk′tə-lē)
n.
  1. A condition characterized by the presence of more than five digits on a hand or foot.hyperdactyly
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.