Having the shape of a ring; circular; annular.

oval (especially in relation to eyes)

(botany) Shaped like a spinning top.

plural of day shape

(nautical) Any of a set of simple geometric shapes that are hung from a mast and visually indicate the status of a vessel to other vessels.

Having the shape of or resembling the shape of a cone.

In poor condition; sick, ailing

plural of shape operator

(geometry, differential geometry) The differential of the Gauss map of an oriented surface at a given point on the surface.

shaped like the letter S