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2 definitions found
 for stoma
From The Collaborative International Dictionary of English v.0.48 :

  Stoma \Sto"ma\, n.; pl. Stomata. [NL., fr. Gr. ?, ?, a mouth.]
     1. (Anat.) One of the minute apertures between the cells in
        many serous membranes.
        [1913 Webster]
  
     2. (Bot.)
        (a) The minute breathing pores of leaves or other organs
            opening into the intercellular spaces, and usually
            bordered by two contractile cells.
        (b) The line of dehiscence of the sporangium of a fern. It
            is usually marked by two transversely elongated cells.
            See Illust. of Sporangium.
            [1913 Webster]
  
     3. (Zool.) A stigma. See Stigma, n., 6
        (a) &
        (b) .
            [1913 Webster]

From WordNet (r) 3.0 (2006) :

  stoma
      n 1: a minute epidermal pore in a leaf or stem through which
           gases and water vapor can pass [syn: stoma, stomate,
           pore]
      2: a mouth or mouthlike opening (especially one created by
         surgery on the surface of the body to create an opening to an
         internal organ)

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