operculum
noun
a part or organ serving as a lid or cover, as a covering flap on a seed vessel.
opercular
-
a word derived from
operculum.
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.
A number of the thyroid-fed were dying, and the skin and opercular membranes were swollen out away from the tissues beneath.
From Hormones and Heredity by J. T. Cunningham
Segmentation is, as in other richly yolked eggs, incomplete, confined to the germinal disk at the opercular pole.
From Encyclopaedia Britannica, 11th Edition, Volume 7, Slice 8 "Cube" to "Daguerre, Louis" by Various
The sub-operculum is minutely crenulated on the edge, and has a small sub-membranous tip, which projects a little beyond the three opercular teeth.
The anterior and posterior opercular valves, when in contact, present some resemblance to a parrot's beak, whence Molina's name.
From Narrative of the surveying voyages of His Majesty's ships Adventure and Beagle, between the years 1826 and 1836 Volume I. - Proceedings of the First Expedition, 1826-1830 by Robert Fitzroy
The movements, however, of the four opercular valves are not at all more independent of the other valves, than in the other Pedunculated Cirripedes; and the peduncle is furnished with all its characteristic muscles.
From A Monograph on the Sub-class Cirripedia With Figures of all the Species. by Charles Darwin
