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a. A projecting gallery at the top of a castle wall, supported by a row of corbels and having openings in the floor through which stones and boiling liquids could be dropped on attackers.
b. One of these openings.
2. A row of small projecting arches used as an ornamental architectural feature.
1. (Fortifications) (esp in medieval castles) a projecting gallery or parapet supported on corbels having openings through which missiles could be dropped
2. any such opening
ma•chic•o•la•tion(məˌtʃɪk əˈleɪ ʃən)
1. an opening in the floor between the corbels of a projecting gallery or parapet, through which missiles might be cast on an enemy below.
2. a gallery or parapet with such openings.