plinthis, ĭdis, f., = πλινθίς (a square tile).
I A square; in architect., a square base , a plinth , for plinthus, Vitr. 3, 3, 2; in land-surveying, for plinthus, Hyg. Condit. Agror. p. 210 Goes.—
II Plur. : plinthĭ-des , a register in the hydraulic organ, Vitr. 10, 8, 8; v. pleuritis.