1.
a device that controls the movement of liquids or gases through pipes or other passages by opening or closing ports and channels
2.
a device in some brass instruments that diverts air down tubes of varying length, thereby altering the pitch
3.
a membranous structure in a hollow organ or vessel such as the heart or a vein that prevents the return flow of fluid passing through it by folding or closing
4.
a segment of the wall of a seed pod or other fruit that splits apart to reveal the contents
5.
a flap that acts like a lid in some types of anthers
6.
either of the two parts of the silica-impregnated cell wall of a type of alga that fit together like the lid and base of a box
7.
a hinged part of the shell of a brachiopod or some mollusks
8.
the single-unit shell of a snail and some other mollusks
9.
an electron tube that is either evacuated or filled with low-pressure gas and in which electrons are pulled from the cathode by an applied anode voltage.
10.
the part of a machine or piece of equipment that opens and closes in order to control the flow of air or liquid
1.
a device that controls the movement of liquids or gases through pipes or other passages by opening or closing ports and channels
2.
a device in some brass instruments that diverts air down tubes of varying length, thereby altering the pitch
3.
a membranous structure in a hollow organ or vessel such as the heart or a vein that prevents the return flow of fluid passing through it by folding or closing
4.
a segment of the wall of a seed pod or other fruit that splits apart to reveal the contents
5.
a flap that acts like a lid in some types of anthers
6.
either of the two parts of the silica-impregnated cell wall of a type of alga that fit together like the lid and base of a box
7.
a hinged part of the shell of a brachiopod or some mollusks
8.
the single-unit shell of a snail and some other mollusks
9.
an electron tube that is either evacuated or filled with low-pressure gas and in which electrons are pulled from the cathode by an applied anode voltage.
10.
the part of a machine or piece of equipment that opens and closes in order to control the flow of air or liquid