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Meaning of superfluid

su•per•flu•id

Pronunciation: (s"pur-fl'id), [key]
— Physics. Physics.
—n.
  1. 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.
—adj.
  1. of or pertaining to a superfluid.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.