Meaning

noun the shorter of the two telegraphic signals used in Morse code

originFrom Middle English ditten, dütten, from Old English dyttan (“to stop up, close”), from Proto-West Germanic *duttijan, from Proto-Germanic *duttijaną, from *duttaz (“wisp”), akin to Icelandic dytta. Related to Old English dott (“dot, point”). More at dot.

Etymology from Wiktionary, CC BY-SA 3.0