[valv], (Noun)

Definitions:
- a device for controlling the passage of fluid or air through a pipe, duct, etc., especially an automatic device allowing movement in one direction only
(e.g: a valve shuts off the flow from the boiler when the water is hot enough)

- each of the halves of the hinged shell of a bivalve mollusc or brachiopod, or of the parts of the compound shell of a barnacle


Phrases:

Origin:
late Middle English (denoting a leaf of a folding or double door): from Latin valva