Pronunciation: (dem'ō),[key] —n., —pl.dem•os.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.
Pronunciation: (dem'ō),[key] —n., —pl.Dem•os.Informal. a member of the Democratic party; Democrat.
a combining form occurring in loanwords from Greek, where it meant “people” (democratic); on this model, used in the formation of compound words (demography).