Webster's English Dictionary

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torus

to.rus \'to-r-*s, 'to.r-\ \'to-(*)r-.i-, 'to.(*)r-, -.e-\ n or to.ri [NL, 
   fr. L, protuberance, bulge, torus molding] pl  1: a smooth rounded 
   anatomical protuberance  2: a large molding of convex profile commonly 
   occurring as the lowest moldi ng in the base of a column 3: RECEPTACLE  4: 
   a doughnut-shaped surface generated by a circle rotated about an axis in  
   its plane that does not intersect the circle; broadly : TOROID