polyfoam

[pol-ee-fohm]

pol·y·foam

[pol-ee-fohm]
noun
a rigid, semirigid, or rubbery foam composed of minute bubbles of air or carbon dioxide embedded in a polymer matrix, often polyurethane: used in mattresses, padding, insulation, etc.

Origin:
poly- + foam
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Polyfoam is always a great word to know.
So is flibbertigibbet. Does it mean:
a chattering or flighty, light-headed person.
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
WordNet
polyfoam

noun
a foam made by adding water to polyurethane plastics 
WordNet® 3.0, © 2006 by Princeton University.
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