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

  Peristome \Per"i*stome\ (p[-e]r"[i^]*st[=o]m), n. [Pref. peri- +
     Gr. sto`ma, sto`matos, mouth.]
     1. (Bot.) The fringe of teeth around the orifice of the
        capsule of mosses. It consists of 4, 8, 16, 32, or 64
        teeth, and may be either single or double.
        [1913 Webster]
     2. (Zool.)
        (a) The lip, or edge of the aperture, of a spiral shell.
        (b) The membrane surrounding the mouth of an invertebrate
            [1913 Webster]

From WordNet (r) 3.0 (2006) :

      n 1: (botany) fringe of toothlike appendages surrounding the
           mouth of a moss capsule
      2: region around the mouth in various invertebrates

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