dah I. \ˈdä\noun ordao\ˈdau̇\ (-s) Etymology: Burmese dā : a large heavy knife used by the Burmese II. noun (-s) Etymology: imitative : a dash in radio or telegraphic code — used by operators as an oral representation of the transmitted sound < many a shortwave radio enthusiast soon may fling his dits and dahs to remote points of the world — Science News Letter >