Botany. the one or two circles of small, pointed, toothlike appendages around the orifice of a capsule or urn of mosses, appearing when the lid is removed.
Zoology. any of various structures or sets of parts that surround or form the walls of a mouth or mouthlike opening.

1790–1800; < Neo-Latin peristoma. See peri-, -stome

peristomal, peristomatic [per-uh-stuh-mat-ik] , peristomial, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
peristome (ˈpɛrɪˌstəʊm)
1.  a fringe of pointed teeth surrounding the opening of a moss capsule
2.  any of various parts surrounding the mouth of invertebrates, such as echinoderms and earthworms, and of protozoans
[C18: from New Latin peristoma, from peri- + Greek stoma mouth]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
peristome   (pěr'ĭ-stōm')  Pronunciation Key 
  1. A fringe of toothlike appendages surrounding the mouth of the spore capsule of some mosses. The teeth unfold under damp conditions and curl up under dry conditions to disperse spores gradually.

  2. The area or parts around the mouth in certain invertebrates, such as the echinoderms.

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