Meanings
nouncanker sore (plural canker sores)
plural canker sores
- An ulcer in the mouth, called an aphthous ulcer, caused by a break in the mucous membrane.
Synonyms & antonyms
nounan ulceration (especially of the lips or lining of the mouth)
Similar
Broader
Also see
Synonym sets from Open English WordNet, CC BY 4.0.
Cite this entry
APA
canker sore. (n.d.). In WatkinsX Dictionary. Retrieved November 4, 2026, from https://dictionary.watkinsx.com/word/canker%20sore
MLA
“canker sore.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/canker%20sore. Accessed November 4, 2026.
Chicago
WatkinsX Dictionary, s.v. “canker sore,” accessed November 4, 2026, https://dictionary.watkinsx.com/word/canker%20sore.
Source: canker sore on Wiktionary, CC BY-SA 4.0.