society > leisure > the arts > music > musical instrument > keyboard instrument > types of organ > [noun] > water-organ (4)
a type of early pipe organ in which water is used to regulate and maintain air pressure; = hydraulus, n.
= hydraulic organ n. at hydraulic, adj. n.special uses.
A hydraulic organ: see A. 2. Obsolete.
A type of water organ popular in classical times; = hydraulic organ n. at hydraulic, adj. n.special uses.