: a refractory person or thing; especially: a heat-resisting ceramic material
First Known Use of REFRACTORY
Medical Definition of REFRACTORY
: resistant to treatment or cure <a refractory fulminant lesion><had disease that was extremely refractory to multiple intensive therapies—Michelle L. Bennett et al>
: unresponsive to stimulus <the refractory period of a muscle fiber>
: resistant or not responding to an infectious agent :immune<refractory to reinfection>
Material that is not deformed or damaged by high temperatures, used to make crucibles, incinerators, insulation, and furnaces, particularly metallurgical furnaces. Refractories are produced in several forms: molded bricks of various shapes, bulk granular materials, plastic mixtures consisting of moistened aggregates that are rammed into place, castables composed of dry aggregates and a binder that can be mixed with water and poured like concrete, and mortars and cements for laying brickwork.