dioecian vs dioecious

dioecian and dioecious both are adjectives.

Word	Noun	Adjective	Verb	Adverb
dioecian	No	Yes	No	No
dioecious	No	Yes	No	No

As adjectives, dioecian and dioecious are synonyms defined as:

dioecian and dioecious: having male and female reproductive organs in separate plants or animals

dioecian (adjective)	dioecious (adjective)
having male and female reproductive organs in separate plants or animals	having male and female reproductive organs in separate plants or animals