What is Bigamus?

Legal Definition
In the civil law. A man who was twice married; one who at different times and successively has married two wives. 4 Inst. 88. One who has two wives living. One who marries a widow. Biganras sen trigamus, etc., est qui diversis temporibus et successive duas sen tres uxores habuit. 4 Inst. 88. A bigamus or trigamus, etc., is one who at different times and successively has married two or three wives.
-- Black's Law Dictionary
Legal Definition
Canon law, Latin. One guilty of bigamy.
-- Bouviers Law Dictionary
Legal Definition
(Roman Law) A bigamist.
-- Ballentine's Law Dictionary