A door; especially, one of a pair of folding doors, or one of the leaves of such a door.
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.
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.
One of the pieces into which a capsule naturally separates when it bursts.
One of the two similar portions of the shell of a diatom.
A small portion of certain anthers, which opens like a trapdoor to allow the pollen to escape, as in the barberry.
One of the pieces or divisions of bivalve or multivalve shells.
Laughter is the valve on the pressure cooker of life. Either you laugh and suffer, or you got your beans or brains on the ceiling. Wavy Gravy
The only big things I've purchased are my dad's heart valve and a Rolls-Royce for my parents, for their anniversary. And that was only because my dad had a Lady Gaga license plate on our old car and it was making me crazy because he was getting followed everywhere, so I bought him a new car. Lady Gaga
I don't believe in life after death. But I do believe in some grinding destiny that watches over us on earth. If I didn't, the safety valve would give and the boiler would explode. Hedy Lamarr