Lewis & Short

ăquālis, e, adj. [aqua]

  1. I. Of or pertaining to water; nubes aquales, Varr. ap. Non p. 46, 2.
    Hence,
  2. II. Subst ăquā-lis, is, comm (sc. urceus or hama), a vessel for washing, a basin, wash-basin, ewer ab aquā aqualis dictus, Varr L L. 5, § 119 Müll pertusi, Cat. ap. Fest p 169 Müll.: dare aqualem cum aquā, Plaut. Curc. 2, 3, 33. bilibris aqualis, id. Mil. 3, 2, 39.