Obstinate and unruly; strongly opposed to something. / Not affected by great heat. / (medicine) Difficult to treat. / (biology) Incapable of registering a reaction or stimulus.

A material or piece of material, such as a brick, that has a very high melting point.

plural of refractory

The quality of being refractory.

(linguistics) A word with no rhyme, a rhymeless word.

plural of refractory metal

(metallurgy) A metal, such as molybdenum or tungsten, with a high refraction, and hence a high melting point.

(biology) The period, after excitation, during which a membrane recovers its polarization and is not able to respond to a second stimulus.

plural of refractory rhyme

plural of refractory period