peristome

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per·i·stome

(per'i-stōm),
A groove leading from the cytostome in ciliates and certain other forms of protozoa.
Synonym(s): peristoma
[peri- + G. stoma, mouth]

peristome

(pĕr′ĭ-stōm′)
n.
1. Botany A fringe of toothlike appendages surrounding the mouth of a moss capsule.
2. Zoology The area or parts around the mouth in certain invertebrates.

per′i·sto′mal (-stō′məl), per′i·sto′mi·al (-stō′mē-əl) adj.

peristome

(pĕr′ĭ-stōm) [″ + stoma, mouth]
The channel leading to the cytosome or mouth in certain types of protozoa.

peristome

any structure that occurs around the mouth or opening of an organ.