Etymology
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foamy (adj.)

Old English faemig "covered with foam;" see foam (n.) + -y (2). Related: Foaminess.

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Definitions of foamy

foamy (adj.)
producing or covered with lathery sweat or saliva from exhaustion or disease;
Synonyms: foaming / frothing
foamy (adj.)
emitting or filled with bubbles as from carbonation or fermentation;
foamy (or frothy) beer
Synonyms: bubbling / bubbly / foaming / frothy / effervescing / spumy
From wordnet.princeton.edu