Emily Dickinson Lexicon

SMART, n.¹ [D. smert; G. schmerz; Dan. smerte. The word is probably formed on the root of L. amarus, bitter, that is, sharp, like Fr. piquant. See the root מרר, Ar. مَرَّ‎‎ marra. Class Mr, No. 7.]

1. Quick, pungent, lively pain; a pricking local pain, as the pain from puncture by nettles; as, the smart of bodily punishment.
2. Severe pungent pain of mind; pungent grief; as, the smart of affliction.