Oestrus

noun Oes·trus \ˈes-trəs, ˈēs-\

Medical Definition of OESTRUS

: the type genus of the family Oestridae that includes the sheep botfly

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

Put-downs with flair

How to use a word that (literally) drives some people nuts.

Test your vocab with our fun, fast game

Ailurophobia, and 9 other unusual fears

Join Us

Merriam-Webster
on Facebook

Merriam-Webster
on Twitter

Bookstore: Digital and Print

Merriam-Webster references for Mobile, Kindle, print, and more.

See All

Other Merriam-Webster Dictionaries