"merlon : (architecture, military, historical) Any of the upright projections between the embrasures..."

“merlon : (architecture, military, historical) Any of the upright projections between the embrasures of a battlement, originally for archers to shield behind while shooting arrows over the embrasures, or through loopholes in the merlons.”

- https://en.wiktionary.org/wiki/merlon#English

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