(geometry) A polyhedron with six faces. The regular hexahedron is the cube, and is one of the Platonic solids.

(geometry) A polygon with six sides and six angles.

six

(countable) A line in a poem having six metrical feet. / (uncountable) A poetic metre in which each line has six feet.

A hollow six-pointed star formed by overlapping two equilateral triangles. / Any of the 64 sets of solid and broken lines, formed by pairs of trigrams, used for divination in the I Ching.

(organic chemistry) an unsaturated aldehyde, CH₃CH=CH-CH=CH-CHO, used in the manufacture of perfumes etc

(geometry) Having six edges, or having a cross-section in the form of a hexagon.

(chemistry, of an acid) containing six replaceable hydrogen atoms / (chemistry, of a salt) having six atoms of a univalent metal

(geometry) any prism, an octahedron, constructed on a hexagonal base

(geometry) A cyclic hexagon with vertices given by the six intersections of the edges of a triangle and the three lines that are parallel to the edges that pass through its symmedian point.