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In medieval battlements, a crossshaped aperture through which crossbowmen shot arrows.

An ornamental canopy over an altar, usually supported on columns, or a similar form over a tomb or throne.

A pseudo-balcony; a low ornamental railing to a window, projecting but slightly beyond the threshold or sill.

An oven constructed of bricks, usually having a circular or oval dome; often located within the hearth of the principal fireplace of

An excavating machine for cutting trenches; a boom-mounted bucket moves toward the machine, cutting the ground like a hoe; then the

A device used to prevent water (or other liquids) from being siphoned into a potable water system.