Cite this Entry
“Aphthous.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/aphthous. Accessed 17 Jan. 2022.
See Definitions and Examples »
Get Word of the Day daily email!
Difficult Spelling Words Quiz
Test your visual vocabulary with our 10-question challenge!
A daily challenge for crossword fanatics.
Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!
Top 10 Latin Phrases
Here's where those fancy shades get their names.
Have we piqued your interest?
Because 200 seemed like overkill
A simple trick to keep them separate
How 'literally' can mean "figuratively"
How to use a word that (literally) drives some pe...
The awkward case of 'his or her'
New Year, Recondite Vocabulary
Take the quiz
Tough words and tougher competition.
Test your visual vocabulary with our 10-question ...