Ge-wæterian

According to the Old English Dictionary:

-wætrian;

ge-wæterian

p. ode; pp. od To water, irrigate; adăquāre, irrĭgāre :-- Ðæt mǽge and cunne óðerra monna inngeþonc giendgeótan and gewæterian [gewætrian, MS. Cot.] that he may be able and know how to irrigate and water the minds of others, Past. 18, 5; Swt. 137, 10; Hat. MS. 27 a, 14. Ic betǽce hig ðam yrþlincge, wel gefylde and gewæterode adsigno eos arātōri, bĕne pastos et adăquātos, Coll. Monast. Th. 20, 31. Teóh ðú forþ rénscúras gif ðú miht and gewætera ðíne æceras bring forth rain-showers, if thou canst, and water thy fields, Homl. Th. ii. 104, 1. ge-wæterian