Medical Definition of valve
1: a bodily structure (as the mitral valve) that closes temporarily a passage or orifice or permits movement of fluid in one direction only
2: any of various mechanical devices by which the flow of liquid (as blood) may be started, stopped, or regulated by a movable part that opens, shuts, or partially obstructs one or more ports or passageways; also : the movable part of such a device
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