torrefy

To dry or parch with heat; roast.

Specifically— In metallurgy, to roast or scorch, as metallic ores.

In pharmacy, to dry or parch, as drugs, on a metallic plate till they become friable or are reduced to any state desired.

To dry by a fire.

To subject to scorching heat, so as to drive off volatile ingredients; to roast, as ores.