“Apertura.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/apertura. Accessed 3 Dec. 2022.
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!
Words Named After People
You know what it looks like… but what is it called?
A daily challenge for crossword fanatics.
When each letter can be seen but not heard
Some may be more useful than others.
One L or two?
Look up any year to find out
How to use a word that (literally) drives some pe...
Or both? Or neither?
Editor Emily Brewster clarifies the difference.
An old-fashioned rule we can no longer put up with.
No Number 2 pencil required.
Take the quiz
See if you can tell the insults from the complime...
You know what it looks like… but what is it cal...
Can you outdo past winners of the National Spelli...