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operculum [operculums]▼noun[UK: ˈɒpəkjˌʊləm] [US: ˈɑːpɚkjˌʊləm]
gill cover▼◼◼◼noun[UK: ɡɪl ˈkʌ.və(r)] [US: ˈɡɪl ˈkʌ.vər]
gill flap▼noun[UK: ɡɪl flæp] [US: ˈɡɪl ˈflæp]
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