/dem"oh/ , n. , pl. demos . Informal.
1. demonstration (defs. 4, 6).
2. demonstrator (def. 5).
3. a phonograph record or tape recording of a new song or of one performed by an unknown singer or singing group, distributed to disc jockeys, recording companies, etc., to demonstrate the merits of the song or performer.
[ 1935-40; by shortening; see -O ]