Bible Dictionaries
Heliotypy
Webster's Dictionary
(n.) A method of transferring pictures from photographic negatives to hardened gelatin plates from which impressions are produced on paper as by lithography.
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Bibliography Information
Webster, Noah. Entry for 'Heliotypy'. Noah Webster's American Dictionary. https://www.studylight.org/dictionaries/eng/web/h/heliotypy.html. 1828.