Pronunciation: (ef"ur-ves'), [key]
—v.i., -vesced, -vesc•ing.
1. to give off bubbles of gas, as fermenting liquors.
2. to issue forth in bubbles.
3. to show enthusiasm, excitement, liveliness, etc.: The parents effervesced with pride over their new baby.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.