'Thermotype' definitions:

Definition of 'Thermotype'

From: GCIDE

Thermotype \Ther"mo*type\, n. [Thermo- + -type.] A picture (as of a slice of wood) obtained by first wetting the object slightly with hydrochloric or dilute sulphuric acid, then taking an impression with a press, and next strongly heating this impression. [1913 Webster]