| 释义 |
ˈpneumatocyst Zool.|-sɪst|
[f. pneumato- + cyst.]
a. An air-sac serving as a float in certain ‘colonial’ or compound Hydrozoa; the pneumatophore, or the cavity contained in this.
b. An air-sac in the body of a bird.
1859Huxley Oceanic Hydrozoa 6 In the adult, this sac, which I shall term the pneumatocyst, is sometimes open at the apex (Physalia, Rhizophysa), and can communicate with the exterior by a pore which traverses the ectoderm of the pneumatophore. 1861J. R. Greene Man. Anim. Kingd., Cœlent. 113 Apolemiadæ. Pneumatocyst small. Cœnosarc filiform. 1884Coues Key N. Amer. Birds 200 The Pneumatocysts.—A bird is literally inflated with these great membranous receptacles of air, and draws a remarkably ‘long breath’—all through the trunk of the body, in several pretty definite compartments. 1895Syd. Soc. Lex., Pneumatocyst, an air-sac, as found in birds, hydrozoa, etc.
Hence ˌpneumatoˈcystic a., belonging to or of the nature of a pneumatocyst.
1890in Cent. Dict. |