The Collaborative International Dictionary of English v.0.48:

Torrefaction \Tor`re*fac"tion\, n. [L. torrefacere,torrefactum,
   to torrefy: cf. F. torr['e]faction. See Torrefy.]
   The act or process of torrefying, or the state of being
   torrefied. --Bp. Hall.
   [1913 Webster]