polyphonous

adjective

1. having or making many sounds
2. Music
   1. of or characterized by polyphony; contrapuntal
   2. that can produce more than one tone at a time, as a piano
3. Phonet. representing more than one sound, as the letter c as in cat and in cereal

Origin: Gr polyphōnos, having many tones: see poly- & -phone