[n] lining consisting of material with a high melting point; used to line the inside walls of a furnace
[adj] resistant to authority or control; "as refractory as a mule"
[adj] stubbornly resistant to authority or control; "a fractious animal that would not submit to the harness"; "a refractory child"
[adj] marked by stubborn resistance to and defiant of authority or guidance; "a recalcitrant teenager"; "everything revolves around a refractory individual genius"
[adj] (medicine) not responding to treatment; "a stubborn infection"; "a refractory case of acne"