Source : Webster's Revised Unabridged Dictionary (1913)

Effervescent \Ef`fer*ves"cent\, a. [L. effervescences, p. pr. of
   effervescere: cf. F. effervescent.]
   Gently boiling or bubbling, by means of the disengagement of
   gas

Source : WordNet®

effervescent
     adj 1: used of wines and waters; charged naturally or artificially
            with carbon dioxide; "sparkling wines"; "sparkling
            water" [syn: {sparkling}] [ant: {still}]
     2: (of a liquid) giving off bubbles [ant: {noneffervescent}]
     3: marked by high spirits or excitement; "his fertile
        effervescent mind"; "scintillating personality";
        "sparkling conversation"; "a row of sparkly cheerleaders"
        [syn: {bubbling}, {scintillating}, {sparkling}, {sparkly}]