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reentrant angle[rē′en·trənt ‚aŋ·gəl]
The angle between two plane surfaces on a crystalline solid, in which the external angle is less than 180°.
An interior angle of a polygon that is greater than 180°.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
An internal angle usually less than 90°.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.