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oculus (pl. oculi).
1. Roundel, circular opening or recess, bull's-eye, or œil-de-bœuf, as in a window in the tympanum of a pediment or at the top of a dome (e.g. the Pantheon, Rome).

2. Button, disc, or eye from which the spirals of a volute progress, e.g. the Ionic capital or a Classical console or modillion.