anestrus
American Heritage Dictionary:
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an·es·trus
(ăn-ĕs'trəs) 
n.
An interval of sexual inactivity between two periods of estrus in female mammals that breed cyclically.
n.
An interval of sexual inactivity between two periods of estrus in female mammals that breed cyclically.
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American Heritage Dictionary
The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.
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