Source : Webster's Revised Unabridged Dictionary (1913)

Hectograph \Hec"to*graph\, n. [Gr. ? hundred + -graph.]
   A contrivance for multiple copying, by means of a surface of
   gelatin softened with glycerin. [Written also {hectograph}.]

Source : WordNet®

hectograph
     n : duplicator consisting of a gelatin plate from which ink can
         be taken to make a copy [syn: {heliotype}]
     v : copy on a duplicator; "hectograph the hand-outs"