Definition of stoma noun from the Oxford Advanced American Dictionary

     

    stoma

     noun
    noun
    NAmE//ˈstoʊmə//
     
     
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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