a bass stop in an organ or harmonium having a froning quality of tone

A term often used for a heavy bell (e.g. several tons in weight).

obsolete member of choir, often librarian or secretary, who doesn't sing any more, and only stays because she believes nobody else would do the job (cf Olde English; burden)

The name Bourdon is derived from the French word for 'buzz' and normally denotes a stopped flute/flue type of pipe in an organ, though in organ building the stop has no "buzz", but rather a very dark, heavy tone, strong in fundamental, with little overtone development.

The bourdon is the heaviest of the bells that belong to a musical instrument, especially a chime or a carillon, and produces its lowest tone.