[1] : 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
see also:
stomata sporangium stigma 

[2] : WordNet (r) 2.0

stoma
     n 1: a minute epidermal pore in a leaf or stem through which
          gases and water vapor can pass syn: 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
     also: stomata pl
see also:
stomate pore stomata 

Stoma >> S Words
Stoma, definition of term: Stoma
stoma_pag1.html