Wiktionary
canker sore
n. An ulcer in the mouth, called an aphthous ulcer, caused by a break in the mucous membrane.
Wikipedia
Canker sore
- redirect Aphthous stomatitis
Usage examples of "canker sore".
When the woman inquired why, he pointed to his mouth and mumbled: Canker sore.
In the full light I saw a canker sore sprouting under his lower lip.
She looked at the man's face he had a two-day growth of beard, and a canker sore on his lip.
She looked at the man's face - he had a two-day growth of beard, and a canker sore on his lip.
As you will find later in these pages, it is also a canker sore that seeks to silence anyone who dares to speak the truth.