Lewis & Short

2. vē- (sometimes vae-) [perh. = Sanscr. vi-in-, vi-dha-va; Lat. vidua; but cf. Curt. Gr. Etym. p. 3809, 135]; an inseparable particle denoting origin, out, which serves either to negative the positive idea lying in the simple word, or to strengthen a simple notion: vegrandis, small; vecors, senseless; vepallidus, very pale; ve-stigo, to search out; Vejovis, an anti-Jove; cf. Gell. 5, 12, 9 sqq.