Webster's English Dictionary

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effervesce

ef.fer.vesce \.ef-*r-'ves\ \-'ves-*n(t)s\ \-*nt\ vi [L effervescere, fr. 
   ex- + fervescere to begin to boil, fr. (Xferve-re to boil - more at BURN 1: 
   to bubble, hiss, and foam as gas escapes  2: to show liveliness or 
   exhilaration  - ef.fer.ves.cence n