“Mitral orifice.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/mitral%20orifice. Accessed 2 Feb. 2023.
Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!
See Definitions and Examples »
Get Word of the Day daily email!
Commonly Confused Words Quiz
Test your vocabulary with our 10-question quiz!
Can you make 12 words with 7 letters?
A lexicographer's best friend
More words, more beautiful, more useless
Spelling isn't all black and white.
Look up any year to find out
One goose, two geese. One moose, two... moose. Wh...
It is in fact a real word (but that doesn't mean ...
Both words imply motion, but the difference may b...
The fascinating story behind many people's favori...
Can you name these antiquated items?
Take the quiz
"Leggings" or "mom jeans"? "Chillax" or "dumpster...
Can you outdo past winners of the National Spelli...