n.
Pronunciation: ri- ' laps, ' r ē - ˌ
Function: noun
Etymology: Middle English, from Medieval Latin relapsus, from Latin relabi to slide back, from re- + labi to slide ― more at SLEEP
Date: 15th century
1 : the act or an instance of backsliding, worsening, or subsiding
2 : a recurrence of symptoms of a disease after a period of improvement