relapser


re·lapse

R0135600 (rĭ-lăps′)intr.v. re·lapsed, re·laps·ing, re·laps·es 1. To return to a former state.2. a. To become sicker after partial recovery from an illness.b. To recur. Used of an illness.3. To slip back into bad ways; backslide.n. (rē′lăps, rĭ-lăps′) A return to a former state, especially after apparent improvement.
[Middle English relapsen, to forswear, from Latin relābī, relāps-, to fall back gradually : re-, re- + lābī, to slide.]
re·laps′er n.