(geometry) A four-dimensional polytope whose twenty-four bounding facets are octahedra and which has no three-dimensional analogue.

(geometry) A four-dimensional polytope, analogous to an octahedron, whose sixteen bounding facets are tetrahedra.

(geometry) A four-dimensional polytope, analogous to a dodecahedron, whose 120 bounding facets are dodecahedra.

(geometry) A four-dimensional polytope, analogous to an icosahedron, whose 600 bounding facets are tetrahedra.

(geometry) A four-dimensional polytope, analogous to a tetrahedron, whose five bounding facets are tetrahedra.

(geometry) A four-dimensional polytope, analogous to a cube, whose eight bounding facets are cubes; a tesseract.

plural of T-cell

(physics) A very small galvanic cell formed by differences in potential between adjacent areas of a metal surface in contact with an electrolyte; implicated in surface corrosion

plural of lasso cell

colloblast