proestrus

noun
pro·​es·​trus | \ (ˌ)prō-ˈe-strəs How to pronounce proestrus (audio) \

Definition of proestrus

: a period immediately preceding estrus characterized by preparatory physiological changes

First Known Use of proestrus

1906, in the meaning defined above

History and Etymology for proestrus

New Latin

Keep scrolling for more

Learn More about proestrus

Statistics for proestrus

Look-up Popularity

Time Traveler for proestrus

The first known use of proestrus was in 1906

See more words from the same year

Keep scrolling for more

More Definitions for proestrus

proestrus

noun
pro·​es·​trus | \ -ˈes-trəs How to pronounce proestrus (audio) \
variants: or proestrum \ -​ˈes-​trəm How to pronounce proestrum (audio) \ or chiefly British pro-oestrus or pro-oestrum \ -​ˈēs-​ How to pronounce pro-oestrum (audio) \

Medical Definition of proestrus

: a preparatory period immediately preceding estrus and characterized by growth of graafian follicles, increased estrogenic activity, and alteration of uterine and vaginal mucosa

More from Merriam-Webster on proestrus

Britannica.com: Encyclopedia article about proestrus

Comments on proestrus

What made you want to look up proestrus? Please tell us where you read or heard it (including the quote, if possible).

WORD OF THE DAY

to take the place or position of

Get Word of the Day daily email!

Test Your Vocabulary

Words for Summer: A Quiz

  • a closeup of a sunflower
  • Which of the following words means “of or relating to summer”?
Name That Thing

Test your visual vocabulary with our 10-question challenge!

TAKE THE QUIZ
Syn City

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!