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Definition of: superfluid
(s′pər·fl′id) noun Physics
A peculiar state of matter noted in helium cooled to within a degree of absolute zero: it is characterized by an exceptional heat conductivity, a ready permeation of very dense substances, and the ability to flow upward against gravity: also called quantum liquid.
—adjective (s′pər·fl′id) Of or pertaining to such a state.
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