(1):

(n.) An hydraulic apparatus, or a system of works or fixtures, by which a supply of water is furnished for useful or ornamental purposes, including dams, sluices, pumps, aqueducts, distributing pipes, fountains, etc.; - used chiefly in the plural.

(2):

(n.) Painting executed in size or distemper, on canvas or walls, - formerly, frequently taking the place of tapestry.