different between operculum vs peristome

English

Etymology

Borrowed from Latin operculum.

Noun

operculum (plural opercula)

1. (zoology) A covering flap in animals, such as a gill cover.
   • 2017, Susannah Lydon, The Guardian, 18 January:

     Hyoliths […] have a small, conical calcium carbonate shell, with a lid called an operculum.

2. (botany) The lidlike portion of a moss sporangium or of a fruit that detaches to allow the dispersal of spores or seeds.
3. (dentistry) A gum flap covering (part of) a partially erupted tooth, usually a wisdom tooth.
4. A structure which serves as a cover or lid.
   • 1901, H. G. Wells, The First Men in the Moon, chapter IX, page 95

     I lifted the circular operculum from its place and laid it carefully on the bale.

5. This term needs a definition. Please help out and add a definition, then remove the text {{rfdef}}.

Related terms

• opercle

Derived terms

• operculitis
• preoperculum
• interoperculum
• suboperculum

Translations

Latin

Etymology

From operi? (“I close”) +? -culum.

Pronunciation

• (Classical) IPA^(key): /o?per.ku.lum/, [??p?rk??????]
• (Ecclesiastical) IPA^(key): /o?per.ku.lum/, [??p?rkulum]

Noun

operculum n (genitive opercul?); second declension

1. cover, covering

Declension

Second-declension noun (neuter).

Descendants

• ? English: opercle, operculum
• ? French: opercule
• ? Italian: opercolo
• ? Portuguese: opérculo
• ? Spanish: opérculo

References

• operculum in Charlton T. Lewis and Charles Short (1879) A Latin Dictionary, Oxford: Clarendon Press
• operculum in Charlton T. Lewis (1891) An Elementary Latin Dictionary, New York: Harper & Brothers
• operculum in Gaffiot, Félix (1934) Dictionnaire illustré Latin-Français, Hachette
• operculum in Harry Thurston Peck, editor (1898) Harper's Dictionary of Classical Antiquities, New York: Harper & Brothers

English

Etymology

From peri- +? Ancient Greek ????? (stóma, “mouth”)

Noun

peristome (plural peristomes)

1. (botany) One or two rings of tooth-like appendages surrounding the opening of the capsule of many mosses.
   • 1911, Bryophyta, article in Encyclopædia Britannica Eleventh Edition,

     Its removal does not, however, leave the mouth of the capsule wide open, for around the margin are two circles of pointed teeth forming the peristome.

2. (zoology) The parts of or surrounding the mouths of numerous invertebrates.
   • 1911, Polyp, article in Encyclopædia Britannica Eleventh Edition,

     We can distinguish therefore in the body of a polyp the column, circular or oval in section, forming the trunk, resting on a base or foot and surmounted by the crown of tentacles, which enclose an area termed the peristome, in the centre of which again is the mouth. […] The mouth may be level with the surface of the peristome, or may be projecting and trumpet-shaped.

3. The lip, or edge of the aperture, of a spiral shell.

Derived terms

• peristomate

See also

• arthrodontous

Further reading

• peristome on Wikipedia.Wikipedia
• peristome at OneLook Dictionary Search

Anagrams

• importees, prosemite, temporise