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(of chemicals, rocks, etc.) not having a crystalline structure
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
Those forms that do not have a definite or specific shape; or a distinctive crystalline, geometric, angular or curvilinear structure.
Illustrated Dictionary of Architecture Copyright © 2012, 2002, 1998 by The McGraw-Hill Companies, Inc. All rights reserved
Pertaining to a solid which is noncrystalline, having neither definite form nor structure.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
Said of rock having no crystal structure.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
amorphousUnorganized or vague. A lack of structure. For example, the amorphous state of a bit on a rewritable optical disc means that the light from a laser beam will scatter and not be as reflective as a highly structured crystalline bit. Contrast with crystalline. See amorphous silicon, amorphous semiconductor, phase change disc and phase change memory.
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