1. A structure in a hollow organ (like the heart) with a flap to insure one-way flow of fluid through it (synset 105402629)
  2. Device in a brass wind instrument for varying the length of the air column to alter the pitch of a tone (synset 104526831)
  3. Control consisting of a mechanical device for controlling the flow of a fluid (synset 104526448)
  4. The entire one-piece shell of a snail and certain other molluscs (synset 101907224)
  5. One of the paired hinged shells of certain molluscs and of brachiopods (synset 101907102)

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