gypsography en · NOUN
Etymology
From gypsum + -graphy.
Meanings
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(uncountable) The art or process of engraving on gypsum.
Maurice Dumont developed his own version of gypsography, executing a number of stylised figures in landscapes in blind embossing and lightly inked. He also produced etchings, drypoints, wood engravings, lithographs and zincographs.
2002, Victor Arwas, Art Nouveau: The French Aesthetic, Papadakis Publisher, →ISBN, page 202: