Source : Webster's Revised Unabridged Dictionary (1913)

Morse alphabet \Morse" al"pha*bet\
   A telegraphic alphabet in very general use, inventing by
   Samuel F.B.Morse, the inventor of Morse's telegraph. The
   letters are represented by dots and dashes impressed or
   printed on paper, as, .- (A), - . . . (B), -.. (D), . (E), ..
   (O), . . . (R), -- (T), etc., or by sounds, flashes of light,
   etc., with greater or less intervals between them.