Definition of "superfluid" [superfluid]

• A fluid, such as a liquid form of helium, exhibiting a frictionless flow at temperatures close to absolute zero. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "As a consequence the Ginzburg-Landau order parameter has here not only two – as in the superconductors – but eighteen components and the superfluid is anisotropic; it can have different properties in different directions."
• "This is the first demonstration of whistling in superfluid helium-4."
• "The pair formation that occurs in superfluid 3He differs from that which occurs between electrons in a superconductor"