fraternal

adjectives

of or relating to a fraternity or society of usually men
"a fraternal order"
fraternal
is derived from
fraternity
pertains to
brotherhood
(of twins) derived from two separate fertilized ova
"fraternal twins are biovular"
biovular, fraternal
antonym
identical
like or characteristic of or befitting a brother
"brotherly feelings"; "close fraternal ties"
brotherlike, brotherly, fraternal