Quantcast
Merriam-Webster Logo
  • Dictionary
  • Thesaurus
  • Scrabble
  • Spanish Central
  • Learner's Dictionary

canker sore

noun

Simple Definition of canker sore

  • : a small painful sore inside the mouth

Source: Merriam-Webster's Learner's Dictionary

Full Definition of canker sore

  1. :  a painful shallow ulcer of the mouth that has a grayish-white base surrounded by a reddish inflamed area and is of uncertain cause but is not due to the virus causing herpes simplex — compare cold sore

Circa 1596

First Known Use of canker sore

circa 1596


CANKER SORE Defined for Kids

canker sore

noun can·ker sore \ˈkaŋ-kər-\

Definition of canker sore for Students

  1. :  a small painful sore of the mouth




Medical Dictionary

canker sore

noun

Medical Definition of canker sore

  1. :  a small painful ulcer especially of the mouth; especially :  a painful shallow ulceration of the oral mucous membranes that has a grayish-white base surrounded by a reddish inflamed area and is characteristic of aphthous stomatitis—compare cold sore




Learn More about canker sore


Seen and Heard

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

WORD OF THE DAY

a very small amount

Get Word of the Day daily email!

WORD GAMES

Take a 3-minute break and test your skills!

alphabet-pasta-spelling-help

Which is the correct spelling?

accommodate acommodate acommadate accomodate
Name That Thing

Test your visual vocabulary with our 10-question challenge!

TAKE THE QUIZ
SCRABBLE® Sprint

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ