LED Definition
 ĕlē-dē, lĕd 
    noun
  
 A semiconductor diode that emits light when voltage is applied: used in electric lighting, alphanumeric displays, as on digital watches, etc.
 Webster's New World 
Synonyms: 
  Other Word Forms of LED
Noun
Singular:
 LEDPlural:
 ledsOrigin of LED
l(ight-)e(mitting) d(iode)
From American Heritage Dictionary of the English Language, 5th Edition
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