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peristome

[per-uh-stohm] /ˈpɛr əˌstoʊm/
noun
1.
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.
2.
Zoology. any of various structures or sets of parts that surround or form the walls of a mouth or mouthlike opening.
Origin
1790-1800
1790-1800; < New Latin peristoma. See peri-, -stome
Related forms
peristomal, peristomatic
[per-uh-stuh-mat-ik] /ˌpɛr ə stəˈmæt ɪk/ (Show IPA),
peristomial, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples from the web for peristome
  • The peristome consists of four large erect teeth, which is a distinctive character for the genus.
  • Under the microscope, the secret to the peristome's slipperiness is clear.
British Dictionary definitions for peristome

peristome

/ˈpɛrɪˌstəʊm/
noun
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
Derived Forms
peristomal, peristomial, adjective
Word Origin
C18: from New Latin peristoma, from peri- + Greek stoma mouth
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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peristome in Science
peristome
  (pěr'ĭ-stōm')   
  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.


The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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