Pronunciation: (hek-sag'u-nl),[key] —adj. 1. of, pertaining to, or having the form of a hexagon.
2. having a hexagon as a base or cross section: a hexagonal prism. 3. divided into hexagons, as a surface.
4. Crystall.noting or pertaining to a system of crystallization in which three equal axes intersect at angles of 60° on one plane, and the fourth axis, of a different length, intersects them perpendicularly.