bipolar
— Adjective
– English
~ of, pertaining to, or occurring in both polar regions; "the bipolar distribution of certain species"
biquadratic
— Adjective
– English
~ involving the fourth and no higher power of a quantity or degree
biracial
— Adjective
– English
~ consisting of or combining two races; "a biracial committee"
biradial
— Adjective
– English
~ showing both bilateral and radial symmetry; "some sea anemones are biradial"
biramous
— Adjective
– English
~ resembling a fork; divided or separated into two branches; "the biramous appendages of an arthropod"; "long branched hairs on its legson which pollen collects"; "a forked river"; "a forked tail"; "forked lightning"; "horseradish grown in poor soil may develop prongy roots"