Hexa/heksə/ Definition 1 of 2Pro Tip 1/3Greek Origin Hexa originates from Greek, where 'hex' means six. A hexagon is derived from the Greek 'hex' for its six angles. Pro Tip 2/3Mathematical Use 'Hexa' is used in math to describe six-sided shapes or six-part processes. A hexahedron is a 3D shape with six faces. Pro Tip 3/3Scientific Terms 'Hexa' is common in science, especially chemistry, to denote six atoms or ions. Hexachloride means a compound with six chlorine atoms.