Early 17th century; earliest use found in Aaron Rathborne (b.?1572), land surveyor and author. Alteration of hexagon, after classical Latin sex six. Compare post-classical Latin sexagonus, Middle French sexagone, both in sense ‘hexagonal’.
Definition of sexagon in US English:
sexagon
nounˈɛksəɡ(ə)n
Mathematics rare
Hexagon.
Origin
Early 17th century; earliest use found in Aaron Rathborne (b. ?1572), land surveyor and author. Alteration of hexagon, after classical Latin sex six. Compare post-classical Latin sexagonus, Middle French sexagone, both in sense ‘hexagonal’.