Early 18th century; earliest use found in William Whiston (1667–1752), natural philosopher and theologian. Either from rhombus + -ical, or from post-classical Latin rhombicusrhombic + -al.
Definition of rhombical in US English:
rhombical
adjectiveˈrɒmbɪkl
Rhombic.
Origin
Early 18th century; earliest use found in William Whiston (1667–1752), natural philosopher and theologian. Either from rhombus + -ical, or from post-classical Latin rhombicus rhombic + -al.