from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. Audible sounds below 90 Hz and extending downward to the lowest frequencies humans can hear, typically 20 Hz.
from the GNU version of the Collaborative International Dictionary of English
- n. The deepest pedal stop, or the lowest tones of an organ; the fundamental or ground bass.
from The Century Dictionary and Cyclopedia
- n. In organ-building, a pedal stop resembling either the open or the stopped diapason, and of 16- or 32-feet tone. Also called subbourdon.
sub- + bass (Wiktionary)