valve

noun

1. a structure in a hollow organ (like the heart) with a flap to insure one-way flow of fluid through it

   noun.body

   Source: WordNet 3.0

2. device in a brass wind instrument for varying the length of the air column to alter the pitch of a tone

   noun.artifact

   Source: WordNet 3.0

3. control consisting of a mechanical device for controlling the flow of a fluid

   noun.artifact

   Source: WordNet 3.0

4. the entire one-piece shell of a snail and certain other molluscs

   noun.animal

   Source: WordNet 3.0

5. one of the paired hinged shells of certain molluscs and of brachiopods

   noun.animal

   Source: WordNet 3.0

6. A door; especially, one of a pair of folding doors, or one of the leaves of such a door.

   noun

   Source: webster1913