1. (

• furnace_lining ,
• refractory

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

1. (

• refractory ,
• stubborn

) not responding to treatment; "a stubborn infection"; "a refractory case of acne"; "stubborn rust stains" ;

2. (

• refractory

) temporarily unresponsive or not fully responsive to a process or stimulus; "the refractory period of a muscle fiber" ;

3. (

• fractious ,
• refractory ,
• recalcitrant

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