Definition of "Bass" :

noun: nontechnical name for any of numerous edible marine and freshwater spiny-finned fishes

noun: the member with the lowest range of a family of musical instruments

noun: the lowest part of the musical range

noun: the lowest adult male singing voice

noun: the lowest part in polyphonic music

noun: any of various North American freshwater fish with lean flesh (especially of the genus Micropterus)

noun: the lean flesh of a saltwater fish of the family Serranidae

noun: an adult male singer with the lowest voice

adjective: having or denoting a low vocal or instrumental range

"A bass voice is lower than a baritone voice."