Definitions for the word "valve" from multiple English dictionaries.
1. n.
A door; especially, one of a pair of folding doors, or one of the leaves of such a door.
Source: The 1913 Webster Unabridged Dictionary, 1913
2. n.
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.
Source: The 1913 Webster Unabridged Dictionary, 1913
3. n.
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.
Source: The 1913 Webster Unabridged Dictionary, 1913
4. n.
One of the pieces into which a capsule naturally separates when it bursts.
Source: The 1913 Webster Unabridged Dictionary, 1913
5. n.
One of the two similar portions of the shell of a diatom.
Source: The 1913 Webster Unabridged Dictionary, 1913
6. n.
A small portion of certain anthers, which opens like a trapdoor to allow the pollen to escape, as in the barberry.
Source: The 1913 Webster Unabridged Dictionary, 1913
7. n.
One of the pieces or divisions of bivalve or multivalve shells.
Source: The 1913 Webster Unabridged Dictionary, 1913
8. n.
1 device controlling flow through a pipe etc., esp. Allowing movement in one direction only. 2 structure in an organ etc. Allowing a flow of blood etc. In one direction only. 3 = *thermionic valve. 4 device to vary the effective length of the tube in a trumpet etc. 5 half-shell of an oyster, mussel, etc. valvular adj. [latin valva leaf of a folding door]
Source: Oxford English Dictionary, 1884
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