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1. A photomechanically produced plate for pictures or type made by exposing a gelatin film under a negative, hardening it with chrome alum, and printing directly from it.
2. also he·li·o·typ·y (-tī′pē) The process of producing a heliotype.

he′li·o·type′ v.
he′li·o·typ′ic (-tĭp′ĭk) adj.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


the process of making pictures by printing directly from gelatin film that has been exposed under a negative and fixed with chrome alum.
See also: Photography
-Ologies & -Isms. Copyright 2008 The Gale Group, Inc. All rights reserved.