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corbel arch[′kȯr·bəl ‚ärch]
A structure resembling an arch, in which successive courses project farther into a gap until they close.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
Masonry built over a wall opening by uniformly advancing courses from each side until they meet at a midpoint. The stepped reveals may be smoothed, even arcuated, but no arch action is effected—not a true arch.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.