Defn: A bracket supporting a superincumbent object, or receiving the spring of an arch. [They] were employed largely in Gothic architecture. Note: A common form consists of courses of stones or bricks, each projecting slightly beyond the next below it.
Machicouli galleries (for vertical defence) were protected either by stone walls built out on corbels, or by strong timber hoardings built in war time, for which the walls were prepared beforehand by recesses left in the masonry.
1911 Encyclopedia Britannica (A-I)
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Philosophy should not be a corbel erected on mystery to gaze upon it at its ease,