- refractory [ri frak′tər ē]adj.[altered < obs. refractary < L refractarius < refractus: see REFRACT]1. hard to manage; stubborn; obstinate: said of a person or animal2. resistant to heat; hard to melt or work: said of ores or metals3.a) not yielding to treatment, as a diseaseb) able to resist diseasen.pl. refractoriessomething refractory; specif., a heat-resistant material used in lining furnaces, etc.refractorilyadv.refractorinessn.
English World dictionary. V. Neufeldt. 2014.