Lewis & Short

sīquandō (better separate, sī quan-dō), adv., if ever, Cic. Lael. 15, 52; id. Verr. 2, 4, 64, § 142; id. Rep. 1, 38, 59; Liv. 8, 4; Verg. G. 3, 98; id. A. 12. 851 al.
Absol., Ov. A. A. 2, 15; Stat. Achill. 1, 509 al.