As adjectives the difference between bigamous and digamous
is that bigamous is (of a marriage) involving bigamy while digamous is pertaining to a second marriage, ie one taking place after the death of the first wife or first husband.
bigamous
English
Adjective
(
en adjective)
(of a marriage) involving bigamy
(of a spouse) guilty of bigamy
digamous
English
Adjective
(
-)
Pertaining to a second marriage, i.e. one taking place after the death of the first wife or first husband.
(
Webster 1913)