toroid

As a noun toroid

is (mathematics) a surface generated by a closed curve (especially a circle) rotating about, but not intersecting or containing, an axis in its own plane.

As an adjective undefined is

lacking a definition or value.

As nouns the difference between toroid and hyperboloid

is that toroid is (mathematics) a surface generated by a closed curve (especially a circle) rotating about, but not intersecting or containing, an axis in its own plane while hyperboloid is a particular surface in three-dimensional euclidean space, the graph of a quadratic with all three variables squared and their coefficients not all of the same sign.

As nouns the difference between annulus and toroid

is that annulus is a ring- or donut-shaped area or structure while toroid is a surface generated by a closed curve (especially a circle) rotating about, but not intersecting or containing, an axis in its own plane.

As nouns the difference between toroid and tornid

is that toroid is (mathematics) a surface generated by a closed curve (especially a circle) rotating about, but not intersecting or containing, an axis in its own plane while tornid is (zoology) any member of the tornidae.

As an adjective torpid

is unmoving, dormant or hibernating.

As a noun toroid is

(mathematics) a surface generated by a closed curve (especially a circle) rotating about, but not intersecting or containing, an axis in its own plane.

As nouns the difference between toroid and toxoid

is that toroid is a surface generated by a closed curve (especially a circle) rotating about, but not intersecting or containing, an axis in its own plane while toxoid is a toxin that has had its toxic properties removed, but retains its ability to generate an immune response.

As nouns the difference between torroid and toroid

is that torroid is while toroid is (mathematics) a surface generated by a closed curve (especially a circle) rotating about, but not intersecting or containing, an axis in its own plane.

As an adjective torrid

is very hot and dry.

As a noun toroid is

(mathematics) a surface generated by a closed curve (especially a circle) rotating about, but not intersecting or containing, an axis in its own plane.

As nouns the difference between taxonomy and toroid

is that taxonomy is the science or the technique used to make a classification while toroid is (mathematics) a surface generated by a closed curve (especially a circle) rotating about, but not intersecting or containing, an axis in its own plane.