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.
References in periodicals archive ?
Instead of continuing to form a normal cylindrical tube, it built a small trumpet-shaped flare, or peristome, in the tube opening.
As the new tube emerged from the hole, it was initially directed upward at an angle of about 45 degrees from the parent's tube, continuous With the peristome formed by the parent immediately prior to constructing the escape hatch (Fig.