superfluidity
Concise Oxford English Dictionary © 2008 Oxford University Press:
superfluidity/suːpəfluːˈɪdɪti/
▶noun Physics the property of flowing without friction or viscosity, as shown by liquid helium below about 2.18 kelvins.
– derivatives
superfluid noun & adjective.
superfluid noun & adjective.
'superfluidity' also found in these Oxford entries:

