Definition of "marconigram"

The marconigram would not carry all the way across the Atlantic...

1908, Society of Friends, Minutes and Proceedings of the Five Years Meeting

At a nod the man brought him a marconigram.

1913, James Andrew White, Jerome W Howe, C S Anderson, The Wireless Age

This was the marconigram which was to be the key to unlock the whole mystery.

1926, George Dilnot, The Story of Scotland Yard

The ship was properly cleared for Portland, U.S.A., subject to orders at that port or on the high seas. A marconigram received at midday altered her destination to Leningrad.

1928, Lawrence R. Bourne, chapter 18, in Well Tackled!‎