The Collaborative International Dictionary of English v.0.48:

Relict \Rel"ict\ (-?kt), n. [L. relicta, fr. of relictus, p. p.
   of relinquere to leave behind. See Relinquish.]
   A woman whose husband is dead; a widow.
   [1913 Webster]

         Eli dying without issue, Jacob was obliged by law to
         marry his relict, and so to raise up seed to his
         brother Eli.                             --South.
   [1913 Webster]

WordNet (r) 3.0 (2006):

relict
    n 1: an organism or species surviving as a remnant of an
         otherwise extinct flora or fauna in an environment much
         changed from that in which it originated
    2: geological feature that is a remnant of a pre-existing
       formation after other parts have disappeared

Bouvier's Law Dictionary, Revised 6th Ed (1856):

RELICT. A widow; as A B, relict of C D.