[ef.fer.vesce] vi -vesced ; -vesc.ing [L effervescere, fr. ex- + fervescere to begin to boil, incho. of fervere to boil--more at brew] (1784) 1: to bubble, hiss, and foam as gas escapes
2: to show liveliness or exhilaration -- ef.fer.ves.cence n -- ef.fer.ves.cent adj -- ef.fer.ves.cent.ly adv