[tad] n [prob. fr. E dial., toad, fr. ME tode--more at toad] (ca. 1877) 1: a small child; esp: boy
2: a small or insignificant amount or degree: bit "might give him some water and a ~ to eat --C. T. Walker" -- a tad : somewhat, rather "looked a tad bigger than me --Larry Hodgson"