Thermotype

1 definition found

From The Collaborative International Dictionary of English v.0.48 [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]