1. (noun) valve
a door; especially, one of a pair of folding doors, or one of the leaves of such a door
2. (noun) valve
a lid, plug, or cover, applied to an aperture so that by its movement, as by swinging, lifting and falling, sliding, turning, or the like, it will open or close the aperture to permit or prevent passage, as of a fluid
3. (noun) valve
one or more membranous partitions, flaps, or folds, which permit the passage of the contents of a vessel or cavity in one direction, but stop or retard the flow in the opposite direction; as, the ileocolic, mitral, and semilunar valves
4. (noun) valve
one of the pieces into which a capsule naturally separates when it bursts
5. (noun) valve
one of the two similar portions of the shell of a diatom
6. (noun) valve
a small portion of certain anthers, which opens like a trapdoor to allow the pollen to escape, as in the barberry
7. (noun) valve
one of the pieces or divisions of bivalve or multivalve shells
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Definition of valve 
