Lewis & Short

ăquĭlex, ĕgis (ĭcis post-class., Tert. adv. Marc. 3, 5; Serv. ad Verg. G. 1, 109), m. [aqua-lego], a conduit-master, water-inspector (= indagator aquarum, Col. 2, 2, 20), Varr. ap. Non. p. 69, 21; Plin. 26, 6, 16, § 30: Plin. Ep. 10, 46; Sen. Q. N. 3, 15.