Definition of sub-bass in US English:

sub-bass

noun

  • 1Music. A deep-sounding stop pitched an octave below the 8-foot or 16-foot principal stop on an organ.

  • 2A sound of a very low frequency, especially (now) a very low bass sound used in dance music; the lowest frequency range of audible sound. Also: a part in a piece of music which is lower than what is usually considered a bass part.

adjective

  • Of sound, especially in music (now usually dance music): very low frequency; lower than what is usually considered a bass sound or part. Also of an instrument, voice, etc.: producing a sound of this type.

Origin

Early 19th century; earliest use found in Harmonicon. From sub- + bass, originally after German Subbass.

Pronunciation

sub-bass

/ˈsʌbˌbeɪs/