a medieval non-portable organ with one manual and no pedals
positive organ in American English
noun
1.
a small pipe organ of the Middle Ages
2.
a section of a pipe organ having mostly flue stops
Word origin
[1720–30]This word is first recorded in the period 1720–30. Other words that entered Englishat around the same time include: arrangement, deadwood, fantail, personify, syllabic