Wiktionary
superglass
n. (context physics English) A phase of matter in which superfluidity and an amorphous (glassy) structure are present at the same time
Wikipedia
Superglass
A superglass is a phase of matter which is characterized (at the same time) by superfluidity and a frozen amorphous structure.
J.C. Séamus Davis theorised that frozen helium-4 (at 0.2 K and 50 Atm) may be a superglass.