an·es·trus 
(ăn-ĕstrəs)
(ăn-ĕstrəs)n.
An interval of sexual inactivity between two periods of estrus in female mammals that breed cyclically.
- whodunnit
- whoever
- whole
- whole blood
- whole-cell vaccine
- whole cloth
- whole enchilada
- whole gale
- wholehearted
- wholeheartedly
- wholeheartedness
- whole hog
- whole language
- whole-language
- whole life insurance
- whole milk
- wholeness
- whole note
- whole number
- whole rest
- wholesale
- wholesaler
- whole schmear
- wholesome
- wholesomely