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foam / fōm/ • n. a mass of small bubbles formed on or in liquid, typically by agitation or fermentation: a beer with a thick head of foam. ∎  a similar mass formed from saliva or sweat. ∎  a thick preparation containing many small bubbles: shaving cream (foam type) does a fine job on my beard. ∎  a lightweight form of rubber or plastic made by solidifying such a liquid. ∎  (the foam) poetic/lit. the sea: Venus rising from the foam. • v. [intr.] form or produce a mass of small bubbles; froth: the sea foamed beneath them. ∎ fig., inf. be very angry: the audience was foaming at the mouth, venting their outrage. DERIVATIVES: foam·less adj. foam·y adj.

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foambrome, chrome, comb, Crome, dome, foam, gnome, holm, Holme, hom, home, Jerome, loam, Nome, ohm, om, roam, Rome, tome •Guillaume • biome • Beerbohm •radome • astrodome • Styrofoam •megohm • Stockholm • Bornholm •motorhome • backcomb • honeycomb •cockscomb, coxcomb •toothcomb • genome • gastronome •metronome • syndrome • palindrome •polychrome • Nichrome •monochrome • velodrome •hippodrome • aerodrome •cyclostome • rhizome

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foam sb. OE. fām = (O)HG. feim :- WGmc. faima :- IE. *poimo-, rel. to L. pūmex PUMICE, OSl. pěna, Skr. phéna- foam.
Hence vb. XIV.