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refreshen
refresher
refresher course
refreshing
refreshment
refried beans
refrigerant
refrigerate
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refractory

re·frac·to·ry [ ri fráktəree ]


adjective 
Definition:
 
1. uncontrollable: stubborn, rebellious, and uncontrollable

2. physics industry heat-resistant: resistant to high temperatures and therefore not easily melted or worked

3. medicine not responsive to treatment: unresponsive to medical treatment
a refractory infection

4. medicine disease-resistant: resistant to infection or disease

5. physiology unresponsive to stimulus: not able to respond to a stimulus
a refractory nerve



noun 
Definition:
 
industry physics highly heat-resistant material: a material that is able to withstand high temperatures without melting, e.g. the fire clay used to line furnaces

[Early 17th century. Variant of refractary< Latin refractarius "stubborn" < refract- (see refract)]

re·frac·to·ri·ness noun
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