Source : Webster's Revised Unabridged Dictionary (1913)

Noma \No"ma\, n. [NL., fr. Gr. ?, lit., a feeding. See {Name}.]
   (Med.)
   See {Canker}, n., 1.

Source : WordNet®

noma
     n : acute ulceration of the mucous membranes of the mouth or
         genitals; often seen in undernourished children