Etymology
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Words related to foam

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

"type of volcanic rock having a loose or cellular structure," formerly used to smooth parchment or vellum, c. 1400, pomis, from Anglo-French and Old French pomis (13c.), from Late Latin pomicem (nominative pomex, genitive pumicis), from Oscan *poimex or some other dialectal variant of Latin pumex "pumice." This word is from PIE *(s)poi-mo-, a root with connotations of "foam, froth" (see foam (n.)), perhaps because pumice resembled a sort of fossilized foam.

With a wide variety of forms in Middle English, including pumish, pumey. Old English had pumic-stan. As a verb, "to polish or smooth with pumice," early 15c., from the noun.

spume (n.)
late 14c., from Old French spume, from Latin spuma "foam" (also source of Italian spuma, Spanish espuma); cognate with Old English fam, Old High German veim "foam" (see foam (n.)).
Styrofoam (n.)
1950, trademark name (Dow Chemical Co.), from -styr- (from polystyrene) + connective -o- + foam (n.).