torrefy
/ˈtɒrɪfʌɪ/verb (torrefies, torrefying, torrefied) [with object] technical
Roast, scorch, or dry (a substance such as an ore, a drug, or a fuel) with heat to drive off all moisture or impurities: torrefying wood loses 30% of the mass but only 10% of the energy
Derivatives
torrefaction
torrefied
Origin
Early 17th century: from French torréfier, from Latin torrefacere 'dry by heat', from torrere 'parch, scorch'.