American English

Definition of stoma noun from the Oxford Advanced American Dictionary



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  1. 1(biology) a tiny pore (= hole) in the outer layer of a plant's leaf or stem
  2. 2(biology) a small opening like a mouth, in some animals
  3. 3(medical) an artificial opening made in an organ of the body , especially in the colon or trachea
See the Oxford Advanced Learner's Dictionary entry: stoma