canker sore

noun

Definition of canker sore

: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

Recent Examples of canker sore from the Web

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'canker sore.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

First Known Use of canker sore

circa 1596


CANKER SORE Defined for English Language Learners

canker sore

noun

Definition of canker sore for English Language Learners

  • : a small painful sore inside the mouth


CANKER SORE Defined for Kids

canker sore

noun can·ker sore \ ˈkaŋ-kər- \

Definition of canker sore for Students

:a small painful sore of the mouth

Medical Dictionary

canker sore

noun

medical Definition of canker sore

: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).

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

to praise usually to excess

Get Word of the Day daily email!

Test Your Vocabulary

Find the Cousins

  • a-large-tree-with-many-branches
  • Which pair shares a common word ancestor?
Name That Thing

Test your visual vocabulary with our 10-question challenge!

TAKE THE QUIZ
Word Winder's CrossWinder

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

TAKE THE QUIZ

Love words? Need even more definitions?

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