torus

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to·rus / ˈtôrəs/ • n. (pl. to·ri / ˈtôrī/ or to·rus·es) 1. Geom. a surface or solid formed by rotating a closed curve, esp. a circle, around a line that lies in the same plane but does not intersect it (e.g., like a ring-shaped doughnut). ∎  a thing of this shape, esp. a large ring-shaped chamber used in physical research.2. Archit. a large convex molding, typically semicircular in cross section, esp. as the lowest part of the base of a column.3. Anat. a ridge of bone or muscle: the maxillary torus.4. Bot. the receptacle of a flower.

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