Etymology
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LED (n.)

1968, initialism (acronym) from light-emitting diode.

led

past tense and past participle of lead (v.). As an adjective, often with the implication of subjection or sycophancy.

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Definitions of LED

led (n.)
diode such that light emitted at a p-n junction is proportional to the bias current; color depends on the material used;
Synonyms: light-emitting diode
From wordnet.princeton.edu