1A mass of small bubbles formed on or in liquid, typically by agitation or fermentation.

1. 1.1A mass of small bubbles formed from saliva or sweat.
   ‘A small opening in the corner of his lips let some saliva foam through.’
   More example sentences

   • ‘The gauchos of Argentina wore chaps that hardened from the foam and sweat of the horse's body, causing them to walk with flexed knees.’
   • ‘Their coats were dark with sweat, and streaked with white foam.’
   • ‘Bryce paused in his tooth brushing, bubbles of minty liquid foam dripping messily down his chin.’
   • ‘The salt bubbled and hissed in its mouth, building to a thick, white foam.’
   • ‘It growled low and deep, with foam bubbling from its mouth.’
   • ‘Snorts and harsh breaths from their mounts, not to mention the lather and foam built up, showed these two riders were headed somewhere, and fast.’
2. 1.2A liquid preparation containing many small bubbles.
   ‘shaving foam’
   More example sentences

   • ‘He said the foam had the consistency of shaving foam, but much smaller, and is entirely harmless.’
   • ‘But the cake, shaped like a Reese's cup with a liquid center and curry-touched foam, is pure yum.’
   • ‘They make a decent café au lait that's served in a glass and topped with a thick, lip-sticking foam.’
   • ‘They spread a thick layer of foam over the forecourt and the blazing vehicles and used water jets to cool gas cylinders in a nearby storage area.’
   • ‘DF200 can be deployed as a foam or liquid spray, with foam application being preferable in most instances.’
   • ‘Instead of old-fashioned, high-dose liquid, doctors inject foam directly in to the swollen vein.’
   • ‘The liquid foam expands very slowly and thus reduces the chance of damaging the wall from over-expanding.’
   • ‘Rio skidded out of the kitchen, face covered in strange, thick white foam.’
   • ‘She coughed and sputtered at the thick foam, and suddenly remembered something else.’
   • ‘Liquid foam is most often used in wall cavities or to seal air gaps in a home's envelope.’
   • ‘‘I like the idea of putting in some of that exploding shaving foam so that when they opened up the capsule they would just get sprayed with foam,’ he said.’
   • ‘They spray foam on the fire, but even in this controlled situation, it's not easy to put out.’
   • ‘As the couple left the church with huge smiles across their faces they were greeted with showers of confetti and children blew foam bubbles.’
   • ‘Victims are sprayed with coloured foam and dragged off stage.’
   • ‘Doctor Mighty rolled over, grabbed one of the KryptoLites, and popped it open in a spray of foam.’
   • ‘You spray this foam on the handles of your current tools and then grip it as you would if using it in the garden.’
   • ‘He expelled a spray of fine white foam which almost extinguished the great log fire in the corner of the snug.’
   • ‘Speaking of which, please turn in all your unopened MRE's that have bubbles or are covered in foam.’
   • ‘Spray foam still has a share, and structural metal has gone beyond the metal building image to cover all types of structures.’
   • ‘For these, Baki lined an old grain bin on the property with insulating spray foam and installed a propane heater unit.’
3. 1.3A lightweight form of rubber or plastic made by solidifying liquid foam.
   as modifier ‘foam rubber’
   More example sentences

   • ‘A piece of dry foam rubber or foam plastic, rubbed over the garment, will usually take them off.’
   • ‘Plastic, foam or rubber thongs are completely casual, but can be worn off the beach nonetheless.’
   • ‘Once the rubber and mounting foam have been cut, the stamps are glued to a wooden mound and are ready to impress!’
   • ‘It'd be a good idea to back the rubbers up with some foam.’
   • ‘Hand-sand smaller or irregular areas with a rubber or foam sanding block.’
   • ‘Imagine if you will, a tennis player's sweatband, slightly bigger and thicker, made of foam with a shiny cover.’
   • ‘Fambeau's new SafeShot bow case has thick eggshell foam.’
   • ‘Utilizing two inch thick foam, you'll need to stack two pieces in the cavity to make up the necessary four inches of total thickness.’
   • ‘Thick foam, gel pads, and extra linen increase the distance between the patient and electrode and should not be used.’
   • ‘Upon opening the tin, I found the walls of the tin neatly lined with thick foam, with an indentation for the mouse pad.’
   • ‘Until the Columbia accident, the part was protected from ice buildup using thick sheets of foam.’
   • ‘Thick foam padding protects the guns and the tough nylon exterior makes for easy transportation.’
   • ‘Its molded plastic yoke, backed with thick foam padding, wraps around the shoulders and attaches to golf bags in one of two places.’
   • ‘The tank will no longer have thick foam insulation on the spot where it tore off Columbia at liftoff.’
   • ‘The pad is three inches thick, a third of which is closed-cell foam.’
   • ‘On top was a quarter-inch thick yellow urethane foam pad.’
   • ‘A very large piece of foam, the so-called PAL ramp foam, fell off the tank.’
   • ‘Second, firm closed-cell foam inside the belt is better than squishy foam because it rebounds better over time.’
   • ‘Opening the box, the first thing you will see is the card itself wrapped in a thick static protection bag and placed in shaped white foam.’
   • ‘Kachel said cast members do wear special kneepads made of foam compressed to a quarter-inch inch thick so as not to show under their unitards.’
4. 1.4the foamliterary The sea.
   More example sentences

   • ‘Venus rising from the foam’

Form or produce a mass of small bubbles; froth.