light-emitting diode

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun LED.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun physics a rectifying semiconductor device which converts electrical energy into electromagnetic radiation of a wavelength in or near the visible spectrum of light.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun diode such that light emitted at a p-n junction is proportional to the bias current; color depends on the material used