Dictionary
su•per•flu•id
Pronunciation: (sOO"pur-flOO'id), [key] Physics.
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n.
a fluid that exhibits frictionless flow, very high heat conductivity, and other unusual physical properties, helium below 2.186 K being the only known example.
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adj.
of or pertaining to a superfluid.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.