A narrow tube.
Any of the small blood vessels (from 5 to 10 micrometres/micrometers (μm) in diameter) that connect arteries to veins (They are the smallest blood vessels in the body: they convey blood between the arterioles and venules).
Of or pertaining to a narrow tube.
Of, relating to, or caused by surface tension.
Of or pertaining to hair.
A vacuum tube.
One of the pieces or divisions of bivalve or multivalve shells.
One of the pieces into which certain fruits naturally separate when they dehisce.
One of the two similar portions of the shell of a diatom.
A device that admits fuel and air into the cylinder of an internal combustion engine, or one that allows combustion gases to exit.
A device that controls the flow of a gas or fluid through a pipe.
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 control the flow in the opposite direction
A small portion of certain anthers, which opens like a trapdoor to allow the pollen to escape, such as in the barberry.
One of the leaves of a folding-door, or a window-sash.
To control (flow) by means of a valve.