[soo-per-floo-id] Physics.
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.
of or pertaining to a superfluid.

1940–45; super- + fluid

superfluidity, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
superfluid (ˌsuːpəˈfluːɪd)
1.  physics a fluid in a state characterized by a very low viscosity, high thermal conductivity, high capillarity, etc. The only known example is that of liquid helium at temperatures close to absolute zero
2.  being or relating to a superfluid

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
superfluid   (s'pər-fl'ĭd)  Pronunciation Key 
A fluid, such as liquid helium, that flows with little or no friction at temperatures close to absolute zero.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
The composition of their cores is unknown, but they may consist of a neutron superfluid or some unknown state of matter.
Normal-state helium damps out vibrations better than superfluid helium.
Suddenly, boiling ceases at the transition from the normal phase of helium to the superfluid phase.
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