light-emitting diode: a semiconductor diode that emits light when conducting current and is used in electronic equipment, esp. for displaying readings on digital watches, calculators, etc.
to guide by going before or with
to influence
to pass (one's life)
to be or go at the head of
to be a route to a place
to result in
the position in advance of others
the extent of such advance
clue
the main part in a play
a semiconductor diode that emits light when a voltage is applied to it and that is used especially in electronic devices (as for an indicator light)
to be or go first
LEAD, to cover with lead (a heavy metallic element) [v]