[ es-truh s, ee-struh s ]
/ ˈɛs trəs, ˈi strəs /


Origin of oestrus

1690–1700; < Latin < Greek oîstros gadfly, sting, madness
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for oestrus

British Dictionary definitions for oestrus


US estrus or US estrum (ˈiːstrəm, ˈɛstrəm)

/ (ˈiːstrəs, ˈɛstrəs) /


a regularly occurring period of sexual receptivity in most female mammals, except humans, during which ovulation occurs and copulation can take place; heat

Derived Forms

oestrous, oestral, US estrous or estral, adjective

Word Origin for oestrus

C17: from Latin oestrus gadfly, hence frenzy, from Greek oistros
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Medicine definitions for oestrus


[ ĕstrəs ]


Variant ofestrus
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.