valve
Meaning
A device for controlling the flow of a liquid or gas through a pipe, etc., by opening or closing a passage.
A structure in the heart or in a vein that lets blood flow in one direction only.
(biology) Each of the two parts of the shell of a mussel, clam, etc.
Usage
The plumber replaced the faulty valve to stop the water leak.
A healthy heart valve ensures blood does not flow backwards.
The scientist examined the fossilized valve of the ancient clam.
Etymology
The word 'valve' entered English in the late 14th century from the Latin 'valva', meaning 'a folding door, a section of a door'. This Latin term is related to 'volvere', meaning 'to roll', suggesting the concept of a turning or hinging mechanism. The anatomical sense, referring to a bodily structure that opens and closes like a door, was established by the early 17th century. The modern mechanical sense, denoting a device for regulating flow, developed naturally from this core idea of a movable part that controls passage.
Analysis
The word 'valve' is a simplex word borrowed as a whole from Latin. It does not contain separable, productive morphemes in modern English spelling.