Ef'fer-vēs'çence or Ef'fer-vēs'çen-çy, n.

n. [Fr. effervescence.] A kind of natural ebullition; that commotion of a fluid which takes place when some part of the mass flies off in a gaseous form, producing innumerable small bubbles; as, the effervescence of wine, cider, or beer; the effervescence of a carbonate with nitric acid.