freemartins

freemartin

[free-mahr-tn]
noun
a female calf that is born as a twin with a male and is sterile as a result of exposure to masculinizing hormones produced by the male.

Origin:
1675–85; origin uncertain

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World English Dictionary
freemartin (ˈfriːˌmɑːtɪn)
 
n
the female of a pair of twin calves of unlike sex that is imperfectly developed and sterile, probably due to the influence of the male hormones of its twin during development in the uterus
 
[C17: of uncertain origin]

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