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gill [gills]▼(gill cover; gill slit)noun[UK: ɡɪl] [US: ˈɡɪl]
operculum [operculums]▼((zoology) covering flap in animals)noun[UK: ˈɒpəkjˌʊləm] [US: ˈɑːpɚkjˌʊləm]
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