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the period of heightened follicular activity preceding estrus.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.
The period in the estrus cycle preceding estrus, characterized by the growth of the graafian follicles and physiologic changes related to estrogen production.
Farlex Partner Medical Dictionary © Farlex 2012
The period immediately before estrus in most female mammals, characterized by development of the endometrium and ovarian follicles.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.
The period preceding estrus, characterized by heightened follicular activity and estrogen production.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012