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
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
The temples before the upper limb of the preoperculum are densely scaly, as is also the gill flap above the upper opercular ridge.
He did not, however, himself realise the relation of the ear-ossicles to the gill-arches, though he knew that Spix and Geoffroy were quite wrong in homologising them with the opercular bones in fish.
From Form and Function A Contribution to the History of Animal Morphology by E. S. (Edward Stuart) Russell
In the argument thus far we have considered terrestrial, adult amphibians, since it is only in these that either the normal middle ear and tympanum, or the opercular apparatus, is present.
From The Ancestry of Modern Amphibia: A Review of the Evidence by Theodore H. (Theodore Hildreth) Eaton
