The Collaborative International Dictionary
Marconigram \Mar*co"ni*gram\, n. [Marconi + -gram.] same as radiogram; a wireless message.
Wiktionary
n. (context dated English) A message sent via radio.
Usage examples of "marconigram".
She was landing with him at New York, but someone amongst the passengers, who guessed what was up, sent a Marconigram to her husband, and he met us at the landing stage.
You had that silly little woman on the steamer in your power, and you yourself, behind your own back, released her with that Marconigram to her husband, sent by yourself.
The first is, are you prepared to produce the Marconigram which you received last evening?
The final fluttering Marconigrams that were released from the Titanic made it certain that the great ship with 2340 souls aboard was filling and in desperate peril.