Source : Webster's Revised Unabridged Dictionary (1913)

Effervesce \Ef`fer*vesce"\, v. i. [imp. & p. p. {Effervesced};
   p. pr. & vb. n. {Effervescing}.] [L. effervescere; ex +
   fervescere to begin boiling, incho., fr. fervere to boil. See
   {Fervent}.]
   1. To be in a state of natural ebullition; to bubble and
      hiss, as fermenting liquors, or any fluid, when some part
      escapes in a gaseous form.

   2. To exhibit, in lively natural expression, feelings that
      can not be repressed or concealed; as, to effervesce with
      joy or merriment.