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peristome
[ per-uh-stohm ]
noun
- 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.
peristome
/ ˈɛɪˌəʊ /
noun
- a fringe of pointed teeth surrounding the opening of a moss capsule
- any of various parts surrounding the mouth of invertebrates, such as echinoderms and earthworms, and of protozoans
peristome
/ ĕ′ĭ-ō′ /
- 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.
- The area or parts around the mouth in certain invertebrates, such as the echinoderms.
Derived Forms
- ˌˈٴdz, adjective
Other yvlog Forms
- i·ٴm ··ٴ·· [per-, uh, -st, uh, -, mat, -ik], i·ٴm· adjective
yvlog History and Origins
Origin of peristome1
yvlog History and Origins
Origin of peristome1
Example Sentences
The "rim" of the cup or peristome is often colourful, it is thought, to catch the eye of passing bugs.
During each forward movement the column is arched downwards so that the peristome is in contact with the surface along which the animal is moving.
Grooves and peristome protected by small plates, which can open over the grooves.
The tentacles surround an area known as the peristome, in the middle of which there is an elongated mouth-opening surrounded by tumid lips.
When moist the peristome closes hygrometrically over the orifice more or less; when drier the teeth or processes commonly bend outward or recurve; and then the spores more readily escape.
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