hexagonal

adjective

1. of, relating 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. Crystallography. 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.

adjective

1. having six sides and six angles
2. of or relating to a hexagon
3. crystallog relating or belonging to the crystal system characterized by three equal coplanar axes inclined at 60° to each other and a fourth longer or shorter axis at right angles to their planeSee also trigonal

1. Having six sides.
2. Relating to a crystal having three axes of equal length intersecting at angles of 60° in one plane, and a fourth axis of a different length that is perpendicular to this plane. The mineral calcite has hexagonal crystals. See illustration at crystal.