Tocsin

noun

  1. an alarm bell or signal.

[Summer Lightning — P.G. Wodehouse]

Torrefy

verb

to dry or roast with fire : PARCH, SCORCH

  1. to subject (ores) to scorching heat so as to drive off volatile ingredients
  2. to dry (drugs) on a hot metallic plate till they are friable or are reduced to the state desired

[Discovered accidentally while trying to find a good synonym for “charred”]