Ground glass

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ground glass

[¦grau̇nd ′glas]
(optics)
A sheet of matte-surfaced glass on the back of a view camera or process camera so that the image of the subject can be focused on it; it is exactly in the film plane.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

Ground glass

Glass whose surface has been roughened with an abrasive, diffusing the light passing through it; produced by sand blasting or etching with acid.
Illustrated Dictionary of Architecture Copyright © 2012, 2002, 1998 by The McGraw-Hill Companies, Inc. All rights reserved

ground glass

Glass having a surface that has been roughened, usually by sandblasting or by acid, to make it nontransparent.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.