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1 Oculus, or any circular element placed in the centre of something, e.g. a bull's-eye circular window in the middle of the tympanum of a pediment.

2 Circular or nearly circular central part of a volute, as in an Ionic capital.

3 Very small, more or less triangular, light in Gothic tracery.

4 Circular base or rim of a cupola, i.e. the circle from which the domed part springs.

Subjects: Architecture.

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