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Webster 1913 Edition

adv.

With foam; frothily.

adv.

Frothily.

foamingly ‎(comparative more foamingly, superlative most foamingly)

With foam.
- 1844, Charles Sealsfield, Life in the New world, or, Sketches of American society
  As we sat there, twenty feet above the rolling waves, which raged foamingly at our side, and looked down into a stream, three hundred feet in depth...