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estrual

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es⋅trus

[es-truhs]
–noun Zoology.
1. Also, es⋅trum [es-truhm] , oestrus. the period of heat or rut; the period of maximum sexual receptivity of the female.
2. estrous cycle.

Origin:
1885–90; < L oestrus oestrus


es⋅tru⋅al [es-troo-uhl] , adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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Word Origin & History

estrus 
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 Eng. sense is of "frenzied passion;" first attested 1890 with meaning "rut in animals, heat."
Online Etymology Dictionary, © 2001 Douglas Harper
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Medical Dictionary

Main Entry: es·tru·al
Pronunciation: 'es-tr&-w&l
Variant: or chiefly British oes·tru·al /'E-str&-w&l/
Function: adjective
: ESTROUS

Main Entry: es·trus
Pronunciation: 'es-tr&s
Variants: or es·trum /-tr&m/ or chiefly British oes·trus/'E-str&s/ or oes·trum /'E-str&m/
Function: noun
1 a : a regularly recurrent state of sexual excitability duringwhich the female of most mammals will accept the male and is capable of conceiving : HEAT b : a singleoccurrence of this state
2 : ESTROUS CYCLE
Merriam-Webster's Medical Dictionary, © 2002 Merriam-Webster, Inc.
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Medical Dictionary

estrus es·trus or oes·trus (ěs'trəs)
n.
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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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.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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