freemartin

 [free-mahr-tn]  

free·mar·tin

   [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
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Freemartin is always a great word to know.
So is doohickey. Does it mean:
a chattering or flighty, light-headed person.
a gadget; dingus; thingumbob.
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Collins
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]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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