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1. Oxford American Dictionary

   operculum

   • IPA[ōˈpərkyəl(ə)m]

   美式

   • n.
     a structure that closes or covers an aperture.；technical term for gill cover

   • noun: operculum, plural noun: opercula

2. • 釋義

   n.

   名詞

   • 1. a structure that closes or covers an aperture.
   • ▪ technical term for gill cover
   • ▪ a secreted plate that closes the aperture of a gastropod mollusk's shell when the animal is retracted.
   • ▪ a part of the spore-containing capsule of a moss that functions as a lid or cover.
3. • 更多解釋

   operculum

   • IPA[ə(ʊ)ˈpəːkjʊləm]

   英式

   • n.
     a structure that closes or covers an aperture.

   Oxford Dictionary