noun Zoology.
Also, estrum [es-truhm] , oestrus. the period of heat or rut; the period of maximum sexual receptivity of the female.

1885–90; < Latin oestrus oestrus

estrual [es-troo-uhl] , adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
estrus (ˈɛstrəs, ˈiːstrəs)
the usual US spelling of oestrus

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1850, from L. oestrus "frenzy, gadfly," from Gk. oistros "gadfly, breeze, sting, mad impulse" (probably cognate with Lith. aistra "violent passion," L. ira "anger"). Earliest English sense is of "frenzied passion;" first attested 1890 with meaning "rut in animals, heat." Related: Estrous.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

estrus es·trus or oes·trus (ěs'trəs)
The periodic state of sexual excitement in the female of most mammals, excluding humans, that immediately precedes ovulation and during which the female is most receptive to mating; heat.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
estrus   (ěs'trəs)  Pronunciation Key 
A regularly recurring period in female mammals other than humans during which the animal is sexually receptive. Estrus occurs around the time of ovulation. Also called heat.
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Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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