| 释义 |
opercular, a. (n.)|əʊˈpɜːkjʊlə(r)|
[f. L. operculum (see below) + -ar1.]
1. Nat. Hist. Of, pertaining to, or of the nature of an operculum; characterized by the presence of an operculum; see also quot. 18571.
opercular apparatus, the gill-cover of fishes, consisting of four pieces, the præoperculum, operculum, suboperculum, and interoperculum.
1830Lindley Nat. Syst. Bot. 265 Anther terminal, opercular. 1835–6Todd Cycl. Anat. I. 308/1 The opercular flap is largely developed in our common Barn-owl. 1849Murchison Siluria x. 238 The opercular plate in Limulus. 1854Woodward Mollusca ii. 251 In the extinct genus Radiolites, both adductors were attached to large toothlike processes of the opercular valve. 1857Mayne Expos. Lex., Opercular,..term applied by Prof. Owen, in his Homologies [1848], to the diverging appendages of the tympano-mandibular arch... In bivalve shells, of which the two valves are unequal, as the Ostrea, applied to the smaller. 1857Henfrey Elem. Bot. i. ii. 116 Opercular dehiscence results from the partial separation of a portion of the wall of the loculus. 1875Huxley in Encycl. Brit. I. 751/2 The gill apertures are closed by the growing over them of an opercular membrane.
2. Furnished with a lid. rare.
1884Health Exhib. Catal. 50/1 Sanitary Stoneware of every description, including..opercular pipes.
B. n. The opercular bone; an operculum.
1893in Funk's Stand. Dict. |