Leviratical is a word that is not widely known, but it refers to the practice of a man marrying his brother's widow. There are several synonyms for the term, including fraternal polyandry and sororal polygyny. Fraternal polyandry is a type of marriage where a woman is married to two or more brothers. Sororal polygyny is the practice of a man marrying multiple wives who are sisters. Other possible synonyms for leviratical include spousal inheritance and brother-in-law marriage. These terms are used to describe a cultural practice that is considered uncommon in many parts of the world, but it has some traditional and cultural roots in certain societies.