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.