Main Entry: su·per·flu·id

Pronunciation: \ˌsü-pər-ˈflü-əd\

Function: noun

Date: 1938

: an unusual state of matter noted only in liquid helium cooled to near absolute zero and characterized by apparently frictionless flow (as through fine holes)

— superfluid adjective

— su·per·flu·id·i·ty \-flü-ˈi-də-tē\ noun