From The Collaborative International Dictionary of English v.0.48:
Telegram \Tel"e*gram\, n. [Gr. ? far + -gram.]
A message sent by telegraph; a telegraphic dispatch.
[1913 Webster]
Note: "A friend desires us to give notice that he will ask
leave, at some convenient time, to introduce a new word
into the vocabulary. It is telegram, instead of
telegraphic dispatch, or telegraphic communication."
--Albany [N. Y.] Evening Journal (April 6, 1852).
[1913 Webster]