CALIX a tube, regulating the supply of water, attached to the
extremity of each pipe, where it entered the castellum of an aqueduct.
(Frontin. Aquaed. 36.) It is explained under AQUAEDUCTUS p. 156 a.
A Dictionary of Greek and Roman Antiquities. William Smith, LLD. William Wayte. G. E. Marindin. Albemarle Street, London. John Murray. 1890.