Definition of "foam" []

  • A mass of bubbles of air or gas in a matrix of liquid film, especially an accumulation of fine, frothy bubbles formed in or on the surface of a liquid, as from agitation or fermentation. (noun)
  • A thick chemical froth, such as shaving cream or a substance used to fight fires. (noun)
  • Frothy saliva produced especially as a result of physical exertion or a pathological condition. (noun)
  • The frothy sweat of a horse or other equine animal. (noun)
  • The sea. (noun)
  • A mass of small bubbles of gas formed on the surface of a liquid, such as the froth produced by agitating a solution of soap or detergent in water (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

  • Frothy saliva sometimes formed in and expelled from the mouth, as in rabies (noun)
  • The frothy sweat of a horse or similar animal (noun)
  • Any of a number of light cellular solids made by creating bubbles of gas in the liquid material and solidifying it: used as insulators and in packaging (noun)
  • (as modifier) (noun)
  • A colloid consisting of a gas suspended in a liquid (noun)
  • A mixture of chemicals sprayed from a fire extinguisher onto a burning substance to create a stable layer of bubbles which smothers the flames (noun)
  • To produce or cause to produce foam; froth (verb)
  • To be very angry (esp in the phrase foam at the mouth) (verb) (c) HarperCollins Publishers Ltd 2016

Use "foam" in a sentence
  • "The most general definition of foam is a substance that is formed by trapping many gas bubbles in a liquid."
  • "I had not heard about this Kevlar-reinforced foam, is there a public web site where I can read about it?"
  • "It costs as little as $US28 to assemble from an Army surplus shoulder bag and some foam from a hardware store, and you use cardboard to both measure out the foam and reinforce the loose compartments of the shoulder bag."