hexagonal
hex.ag.o.nal \hek-'sag-*n-*l\ \-*l-e-\ aj 1: having six angles and six sides 2: having a hexagon as section or base 3: relating to or being a crystal system characterized by three equal late ral axes intersecting at angles of 60 degrees and a vertical axis of variable length at right angles - hex.ag.o.nal.ly av