[ es-truhs ]

  1. Also es·trum [es-truhm], /ˈɛs trəm/, oestrus. the period of heat or rut; the period of maximum sexual receptivity of the female.

Origin of estrus

1885–90; <Latin oestrusoestrus

Other words from estrus

  • es·tru·al [es-troo-uhl], /ˈɛs tru əl/, adjective

Words Nearby estrus Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

British Dictionary definitions for estrus


/ (ˈɛstrəs, ˈiːstrəs) /

  1. the usual US spelling of oestrus

Derived forms of estrus

  • estrous, adjective

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

Scientific definitions for estrus


[ ĕstrəs ]

  1. 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 © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.