estrual

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.

Origin:
1885–90; < Latin oestrus oestrus

es·tru·al [es-troo-uhl] , adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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World English Dictionary
estrus (ˈɛstrəs, ˈiːstrəs) [Click for IPA pronunciation guide]
 
n
the usual US spelling of oestrus
 
'estrous
 
adj

00:10
Estrual is always a great word to know.
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a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
oestrus, estrus or estrum (ˈiːstrəs, ˈɛstrəs, ˈiːstrəm, ˈɛstrəm) [Click for IPA pronunciation guide]
 
n
a regularly occurring period of sexual receptivity in most female mammals, except humans, during which ovulation occurs and copulation can take place; heat
 
[C17: from Latin oestrus gadfly, hence frenzy, from Greek oistros]
 
estrus, estrus or estrum
 
n
 
[C17: from Latin oestrus gadfly, hence frenzy, from Greek oistros]
 
estrum, estrus or estrum
 
n
 
[C17: from Latin oestrus gadfly, hence frenzy, from Greek oistros]
 
'oestrous, estrus or estrum
 
adj
 
'oestral, estrus or estrum
 
adj
 
'estrous, estrus or estrum
 
adj
 
'estral, estrus or estrum
 
adj

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
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 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)
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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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.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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