| 单词 | pneumatic duct |
| 释义 | > as lemmaspneumatic duct pneumatic duct n. Zoology a short tube connecting the swim bladder of physostomous fishes with the oesophagus. ΚΠ 1763Pneumatic duct [see sense A. 3b]. 1876 H. A. Nicholson Man. Zool. lviii. 401 The swim-bladder is single,..with a pneumatic duct and glottis. 1997 G. S. Helfman et al. Diversity of Fishes v. 63/2 The gas bladder is derived as an outpocket from the esophagus, and in some groups it retains its connection to the gut via the pneumatic duct (the physostomous condition). < as lemmas |
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