n.
Pronunciation: ˌ sü-p ə r- ' flü- ə d
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- ' i-d ə -t ē \ noun