lev·i·rate (lěv'ər-ĭt, -ə-rāt', lē'vər-ĭt, -və-rāt') n. The practice of marrying the widow of one's childless brother to maintain his line, as required by ancient Hebrew law.
[From Latin lēvir, husband's brother; see daiwer- in Indo-European roots.] lev'i·rat'ic (-rāt'ĭk), lev'i·rat'i·cal adj.