le·vi·rate /ˈlɛvərət, ˈli, ˌret/
寡婦與亡夫兄弟的結婚
Lev·i·rate Lev·i·rat·ic·al a. Of, pertaining to, or in accordance with, a law of the ancient Israelites and other tribes and races, according to which a woman, whose husband died without issue, was married to the husband's brother.
The firstborn son of a leviratical marriage was reckoned and registered as the son of the deceased brother. --Alford.
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levirate
n : the biblical institution whereby a man must marry the widow
of his childless brother in order to maintain the
brother's line