
1) Estrus 2) Heat 3) Physiological condition 4) Physiological state
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1) Estrus
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https://www.crosswordclues.com/clue/oestrus

Latin, meaning: horse-fly, frenzy.
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http://archives.nd.edu/ooo.htm
[genus] Oestrus is a genus of bot flies, from the family Oestridae The genus includes the sheep bot fly (Oestrus ovis Linnaeus, 1758) that is a major pest in the Australian sheep industry. There are approximately 34 species in the genus. == Species == Genus: Oestrus Linnaeus, 1758 ...
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http://en.wikipedia.org/wiki/Oestrus_(genus)

• (n.) A vehement desire; esp. (Physiol.), the periodical sexual impulse of animals; heat; rut. • (n.) A genus of gadflies. The species which deposits its larvae in the nasal cavities of sheep is oestrus ovis.
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http://thinkexist.com/dictionary/meaning/oestrus/

A cat's reproductive cycle or 'heat'. The oestrus cycle in the cat is triggered by changes in daylight.
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http://www.cats.org.uk/cat-glossary/

1. <zoology> A genus of gadflies. The species which deposits its larvae in the nasal cavities of sheep is oestrus ovis. ... 2. A vehement desire; especially. ... <physiology> The periodical sexual impulse of animals; heat; rut. ... Origin: L, a gadfly; also, frenzy, fr.Gr. Gadfly; hence, sting, fury, insane desire, frenzy. ... Source: W...
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http://www.encyclo.co.uk/local/20973

(es´trәs) a genus of botflies. O. o´vis deposits its larvae in the nostrils of sheep and goats and can cause ocular myiasis in humans.
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http://www.encyclo.co.uk/local/21001

Menstrual cycle is the monthly female cycle during which the womb (uterus) is prepared for the implantation of a fertilised egg cell. If fertilisation does not occur, the inside lining of the uterus is shed, resulting in the loss of blood. In animals the period during which the female is receptive to the male animal is termed oestrus
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http://www.encyclo.co.uk/local/21114
OEs'trus noun [ Latin , a gadfly; also, frenzy, from Greek ... gadfly; hence, sting, fury, insane desire, frenzy.]
1. (Zoology) A genus of gadflies. The species which deposits its larvæ in the nasal cavities of sheep is
œstrus ovis .
2. A vehement desire; esp...
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http://www.encyclo.co.uk/webster/O/13

Type: Term Pronunciation: es′trŭs Definitions: 1. A genus of tissue-invading flies that cause myiasis in sheep; the head botflies in the family Oestridae. Oestrus ovis (a nose fly) is a grayish brown, robust, hairy, beelike botfly, imported from Europe, and now a serious pest in parts of the U.S.; larvae are deposited by the adult fly in...
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http://www.medilexicon.com/medicaldictionary.php?t=62313

[
n] - type genus of the Oestridae: sheep botflies
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http://www.webdictionary.co.uk/definition.php?query=Oestrus
genus Oestrus noun type genus of the Oestridae: sheep botflies
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https://www.encyclo.co.uk/local/20974

In mammals, the period during a female's reproductive cycle (also known as the oestrus cycle or menstrual cycle) when mating is most likely to occur. It usually coincides with ovulation, when egg cells are released from the ovary
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https://www.encyclo.co.uk/local/21221
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