(noun) lining consisting of material with a high melting point; used to line the inside walls of a furnace

(adjective satellite) resistant to authority or control; "as refractory as a mule"

(adjective satellite) stubbornly resistant to authority or control; "a fractious animal that would not submit to the harness"; "a refractory child"

(adjective satellite) marked by stubborn resistance to and defiant of authority or guidance; "a recalcitrant teenager"; "everything revolves around a refractory individual genius"

(adjective satellite) not responding to treatment; "a stubborn infection"; "a refractory case of acne"

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