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(regulae), in structures of the Doric order, the six small projections shaped like truncated cones and placed on the lower surface of each shelf above and below the triglyphs and also above the metopes.
gutta ( pl. guttae)
In Classical architecture, one of a number of pendant ornaments in a rectangular arrangement; each gutta is shaped like an inverted frustum of a cone, i.e., a cone in which the upper tip has been lopped off; usually found on the underside of the mutules of a Doric entablature.