Alternative spelling of encorbellment; architectural support using corbels.
Variant spelling of encorbellment, from en- + corbel + -ment. The single 'l' version is less common but represents the same architectural concept.
This is one of those words with competing spellings where English never quite settled on a standard. 'Encorbellment' (with double-l) won out, but 'encorbelment' lingers in some architectural texts—a reminder that standardized spelling is surprisingly recent.
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