Definition of telegraph
(Entry 1 of 2)
1
: an apparatus for communication at a distance by coded signals
especially
: an apparatus, system, or process for communication at a distance by electric transmission over wire
2
: telegram
telegraph
verb
telegraphed; telegraphing; telegraphs
Definition of telegraph (Entry 2 of 2)
1a
: to send or communicate by or as if by telegraph
b
: to send a telegram to
c
: to send by means of a telegraphic order
2
: to make known by signs especially unknowingly and in advance
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Merriam-Webster unabridged
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Time Traveler for telegraph
The first known use of telegraph was in 1793
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