torus
n//toʊ̯ɹəs//torus
(geometry) The standard representation of such a space in 3-dimensional Euclidean space: a surface or solid formed by rotating a closed curve, especially a circle, about a line which lies in the same plane but does not intersect it (e.g. like a ring doughnut).
(topology) A topological space which is a product of two circles.