main diagonal(redirected from Counterdiagonal)
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main diagonal[¦mān dī′ag·ən·əl]
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
A diagonal member of a web, joining the top and bottom chords of a truss.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.