DICT.TW Dictionary Taiwan

 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