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Science > General science 
radio transmitter
Science; General science
A generator of radio-frequency (rf) signals for wireless communication over some distance, which can vary from the short ranges within a building to intercontinental distances. ...
retaining wall
Science; General science
A generic structure that is employed to restrain a vertical-faced or near-vertical-faced mass of earth. The earth behind the wall may be either the natural embankment or the ...
cast iron
Science; General science
A generic term describing a family of iron alloys containing 1.8–4.5% carbon. Cast iron usually is made into specified shapes, called castings, for direct use or for processing ...
lamp
Science; General science
A generic term for a device designed to produce electromagnetic radiation in the form of light, heat, ultraviolet energy, or a combination of the three. The term lamp is applied ...
projective geometry
Science; General science
A geometry that investigates those properties of figures that are unchanged (invariant) when the figures are projected from a point to a line or plane. Although isolated theorems ...
sebaceous gland
Science; General science
A gland which produces and liberates sebum, a mixture composed of fat, cellular debris, and keratin. When the gland arises in association with a hair follicle, it forms a ...
glass switch
Science; General science
A glassy, solid-state device used to control the flow of electric current. Useful solid-state devices can be made from glassy as well as crystalline semiconductors. Crystals ...
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- Acoustics (1199)
- Basic science (4082)
- General science (120567)