1
: a large molding of convex profile commonly occurring as the lowest molding in the base of a column
2
: the thickening of a membrane closing a wood-cell pit (as of gymnosperm tracheids) having the secondary cell wall arched over the pit cavity
3
: a doughnut-shaped surface generated by a circle rotated about an axis in its plane that does not intersect the circle
broadly
: toroid
4
: a smooth rounded anatomical protuberance (such as a bony ridge on the skull)
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Merriam-Webster unabridged
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