operculum
noun
a part or organ serving as a lid or cover, as a covering flap on a seed vessel.
opercula
-
pluralof operculum.plural
The grammatical form denoting more than one person, place, thing, or idea.
Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
The Potamides inhabit the mouths of rivers in warm latitudes, and are distinguishable from the marine Cerithia by their orbicular and multispiral opercula.
From The Student's Elements of Geology by Sir Charles Lyell
It was easy to see that the stones are thin and porous opercula, which have formed part of small univalve shells.
From Personal Narrative of Travels to the Equinoctial Regions of America, During the Year 1799-1804 — Volume 1 by Thomasina Ross
These calcareous opercula effervesce with lemon juice, and put themselves in motion in proportion as the carbonic acid is disengaged.
From Personal Narrative of Travels to the Equinoctial Regions of America, During the Year 1799-1804 — Volume 1 by Thomasina Ross
A still more highly endowed relation spins a similar fabric, upon which are loosely agglutinated numbers of small dead shells, grit, and even opercula a quarter of an inch in diameter.
From My Tropic Isle by E. J. (Edmund James) Banfield
These are the plate-like swimmerets and opercula of Gigantostraca and Limulus among Arachnids and of Isopod Crustaceans.
From Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 6 "Armour Plates" to "Arundel, Earls of" by Various
