Is it ensure, insure, or assure?
"a widow," mid-15c., from Old French relict, fem. relicte "person or thing left behind" (especially a widow) and directly from Medieval Latin relicta "a widow," noun use of fem. of relictus "abandoned, left behind," past participle adjective from Latin relinquere "to leave behind" (see relinquish).
relict rel·ict (rěl'ĭkt, rĭ-lĭkt')
Something that has survived; a remnant.