from the GNU version of the Collaborative International Dictionary of English
- n. one of the three or five distinct organs included in the full organ, each separable from the rest, but all controlled by one performer; a portion of the full organ, complete in itself, and more practicable for ordinary service and in the accompanying of the vocal choir.
from The Century Dictionary and Cyclopedia
- n. In large organs, the third principal section of the instrument, of less power than the great organ, and containing stops specially suited for choir accompaniment. Once called the chair-organ; occasionally, also, the positive organ.
Sorry, no etymologies found.