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.

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