This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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

n. A substance, such as liquid helium, that exhibits superfluidity.

adj. Of, pertaining to, or exhibiting superfluidity.

"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."