Medical Dictionary

external os

noun

medical Definition of external os

:the opening of the uterine cervix into the vagina

Seen and Heard

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

Love words? Need even more definitions?

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

WORD OF THE DAY

of yeast or being unsettled or frivolous

Get Word of the Day daily email!

Love words? Need even more definitions?

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