A half-moon shaped object or structure, such as a crescent-shaped fortification or architectural element.
From French demi- (half) and lune (moon), literally meaning 'half-moon'. Used in military fortifications and architecture from the 16th century onward to describe curved defensive structures.
Medieval fortress builders loved demilunes because a crescent-shaped defensive wall meant attackers got hit with crossfire from multiple angles—it's a clever geometric trick that's still used in modern security design.
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