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‖ œstrus|ˈiːstrəs, ˈɛs-|
Also (U.S.) estrus.
[L. œstrus, a. Gr. οἶστρος gad-fly, breeze, also sting, hence frenzy, mad impulse.]
1. Entom. A genus of dipterous insects, of which the larvæ are parasitic in the bodies of various animals; an insect of this genus or of the family Œstridæ; a gad-fly or bot-fly.
1697Dryden Virg. Georg. iii. 238 This flying Plague..Oestros the Grecians call: Asylus, we: A fierce loud buzzing Breez. 1752Sir J. Hill Hist. Anim. 30 The black and yellow-bodied Œstrus, with black variegations in the wings. 1846C. G. Prowett Prometheus Bound 59 Virgil powerfully describes the terrors of the maddened cattle from the torment of the œstrus. 1876Duhring Dis. Skin 585 Œstrus, or Bot Fly deposits the ova unknown to the individual.
2. a. fig. Something that stings or goads one on, a stimulus; vehement impulse; passion, frenzy.
1850E. FitzGerald Lett. (1889) I. 208 The Impetus, the Lyrical oestrus, is gone. 1874Morley Compromise iii. (1888) 114 They too were pricked by the œstrus of intellectual responsibility. 1880M. Pattison Milton xii. 161 [Milton] would not write more verses when the œstrus was not on him.
b. Physiol. A vehement bodily appetite or passion; spec. sexual orgasm; the rut of animals. In mod. use: The rut or heat (heat n. 13) of female mammals, or the period during which this lasts.
1890Billings Nat. Med. Dict. II. 233 Œstrus... 1. Rut, orgasm, clitoris. 1900Q. Jrnl. Microsc. Sci. XLIV. 6 Œstrus may be a brief period and exist for only a few hours. Ibid., The period of œstrus is referred to by various writers as ‘Brunst’, ‘rut’, ‘heat’, ‘season’, ‘brim’, or ‘œstrum’. Ibid. 17 The duration of the œstri. 1904Phil. Trans. R. Soc. B. CXCVI. 67 Œstrus was noted in a Black-faced ewe. 1963A. Heron Towards Quaker View of Sex 54 In the baboon..females in oestrus will mate with other males if their overlord's attention is temporarily distracted. 1974Encycl. Brit. Macropædia VIII. 1083/1 Estrogens are substances that evoke the cyclical onset of heat, or estrus, during which the animal is sexually active and receptive to the male. 1974Country Life 12 Dec. 1853/1 There was mention of what is termed ‘synchronised oestrus’. By the use of drugs cows are induced to come in season at a prearranged time. |