4. Hence, something that gives or enhances a pleasant taste, or the taste itself; an appetizer; also, keen enjoyment; relish; gusto. Almighty Vanity! to thee they owe Their zest of pleasure, and their balm of woe. (young) Liberality of disposition and conduct gives the highest zest and relish to social intercourse. (Gogan)
Origin: F. Zeste, probably fr. L. Schistos split, cleft, divided, Gr, from to split, cleave. Cf. Schism.