Zoology. Any of various other structures covering or closing an aperture; spec. (a) a small bone in the middle ear of amphibians or (formerly) in…
| 单词 | θ34235 | 
| 释义 | the world > animals > invertebrates > phylum Arthropoda > class Insecta > parts of insects > 			[noun]		 > thorax > metathorax > covering of spiracles on (1)		 operculum1816 Zoology. Any of various other structures covering or closing an aperture; spec. (a) a small bone in the middle ear of amphibians or (formerly) in…  | 
	
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