freemartin(redirected from Free marten)
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A female animal, usually a calf, that is born as the twin of a male animal and is sterile because of having abnormal internal reproductive organs.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.
freemartina female twin born with a male, in which normal female sexual development has been adversely affected by hormones produced by the male twin.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005