composed of or resembling keratin; horny.

1895–1900; keratin + -ous Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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American Heritage
Medical Dictionary

keratinous ke·rat·i·nous (kə-rāt'n-əs)

  1. Relating to or resembling keratin.

  2. Horny.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
Spurs have a bony core and are covered with a keratinous material similar to our fingernails.
The hagfish's jawless mouth contains two parallel rows of pointed keratinous teeth, which are secured to rasping dental plates.
Their small heads had a keratinous beak and tiny leaf-shaped teeth.
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