nonacoptic

Etymology
, introduced by the mathematician to clarify terminology in the geometry of polygons and polyhedra. Initially he used the term coptic, but abandoned it in favor of nonacoptic in later writings.

Adjective

 * 1)  Self-intersecting.
 * 2) * 1999, Grünbaum, Branko, "Acoptic polyhedra", Advances in discrete and computational geometry (South Hadley, MA, 1996) (PDF), Contemp. Math., 223, Amer. Math. Soc., Providence, RI, pp. 163–199, doi:10.1090/conm/223/03137, MR 1661382.
 * See Norgate [N2], where nonacoptic pentahedra are investigated as well.

Antonyms

 * acoptic