Feeling of hearing hums or sounds that are not real, but occur within the auditory system. It is also found as 'acufene' and is of Greek etymology, 945; 954; 959; 965; 969; (acouo "hear" ) 966; 945; 953; 957; 949; 953; 957; ( faínein "appear, manifest as phenomenon, fantasy" ) . See phosphene, tinnitus .