A corroding or sloughing ulcer; esp. a spreading gangrenous ulcer or collection of ulcers in or about the mouth; -- called also water canker, canker of the mouth, and noma.

Anything which corrodes, corrupts, or destroy.

To affect as a canker; to eat away; to corrode; to consume.

To infect or pollute; to corrupt.

To be or become diseased, or as if diseased, with canker; to grow corrupt; to become venomous.

An open sore on the lip or skin inside the mouth.

an ulceration (especially of the lips or lining of the mouth)

a sore that appears as a small, white ulcer or blister in the mouth or on the lips

An ulcerous sore of the mouth and lips, not considered fatal today. Synonym: aphthous stomatitis. See cancrum otis.

sore (1) - a type of benign mouth ulcer often caused by injury to the mucosal lining of the oral cavity, viral infection or vitamin deficiency.

Sore inside the mouth or skin.