high-tem|per|a|ture superconductor

high-tem|per|a|ture superconductor «HY TEHM puhruh chuhr, -chur; -pruh-»,

any one of a class of ceramic compounds conducting electric current with no resistance at temperatures above 77 degrees Kelvin (the boiling point of liquid nitrogen): »

The new high-temperature superconductors…may revolutionize various technologies by allowing electricity to flow without losses and without much cooling—making magnetically levitated trains feasible, for example (Science News).