Definition of foam
1 : a light frothy mass of fine bubbles formed in or on the surface of a liquid or from a liquid: such asa : a frothy mass formed in salivating or sweatingb : a stabilized froth produced chemically or mechanically and used especially in fighting oil firesc : a material in a lightweight cellular form resulting from introduction of gas bubbles during manufacture
2 : sea
3 : something resembling foam
From the M-W Editors
Examples of foam in a Sentence
As I poured the beer, foam bubbled up in the glass.
The fire extinguisher is filled with foam.
a can of shaving foam
Origin and Etymology of foam
Middle English fome, from Old English fām; akin to Old High German feim foam, Latin spuma foam, pumex pumice
First Known Use: before 12th century
foam
Definition of foam
intransitive verb
1a : to produce or form foamb : to froth at the mouth especially in anger; broadly : to be angry
2 : to gush out in foam
3 : to become covered with or as if with foam streets … foaming with life — Thomas Wolfe
transitive verb
1 : to cause to foam; specifically : to cause air bubbles to form in
2 : to convert (something, such as a plastic) into a foam
Examples of foam in a Sentence
The soda foamed in the glass.
The mixture will bubble and foam when you add the yeast.
Before 12th Century
First Known Use of foam
before 12th century
FOAM Defined for English Language Learners
foam
playDefinition of foam for English Language Learners
-
: a mass of small bubbles that are formed in or on a liquid
-
: a substance that is like a thick liquid made of many small bubbles
-
: a soft material that is used to make many products
foam
Definition of foam for English Language Learners
-
: to produce foam
FOAM Defined for Kids
Definition of foam for Students
: a mass of tiny bubbles that forms in or on the surface of a liquid
Definition of foam for Students
foamed
;foaming
: to produce or form a mass of tiny bubbles Baking soda will foam when you add vinegar.
Medical Dictionary
foam
playMedical Definition of foam
: a light frothy mass of fine bubbles formed in or on the surface of a liquid spermicidal foam
foam
verbLearn More about foam
-
See words that rhyme with foam Thesaurus: All synonyms and antonyms for foam Spanish Central: Translation of foam Nglish: Translation of foam for Spanish speakers Britannica English: Translation of foam for Arabic speakers Britannica.com: Encyclopedia article about foam
Seen and Heard
What made you want to look up foam? Please tell us where you read or heard it (including the quote, if possible).
Writing? Check your grammar now!