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oestrus

[es-truh s, ee-struh s] /ˈɛs trəs, ˈi strəs/
noun
1.
Origin
1690-1700
1690-1700; < Latin < Greek oîstros gadfly, sting, madness
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for oestrus

oestrus

/ˈiːstrəs; ˈɛstrəs/
noun
1.
a regularly occurring period of sexual receptivity in most female mammals, except humans, during which ovulation occurs and copulation can take place; heat
Derived Forms
oestrous, oestral, (US) estrous, estral, adjective
Word Origin
C17: from Latin oestrus gadfly, hence frenzy, from Greek oistros
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for oestrus
n.

see estrus.

Online Etymology Dictionary, © 2010 Douglas Harper
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oestrus in Medicine

oestrus oes·trus (ěs'trəs)
n.
Variant of estrus.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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