Merriam-Webster's Collegiate® Dictionary, 11th Edition
RINSE
I. transitive verb (rinsed; rinsing)
Etymology: Middle English rincen, from Anglo-French rincer, alteration of Old French recincier, from Vulgar Latin *recentiare, from Latin recent-, recens fresh, recent
Date: 14th century
to cleanse by flushing with liquid (as water),
2. to cleanse (as of soap used in washing) by clear water, to treat (hair) with a rinse, to remove (dirt or impurities) by washing lightly or in water only, rinser noun
II. noun
Date: 1837
the act or process of rinsing,
2. liquid used for rinsing, a solution that temporarily tints hair