lav·age 
(lăvĭj, lä-väzh)
(lăvĭj, lä-väzh)n.
A washing, especially of a hollow organ, such as the stomach or lower bowel, with repeated injections of water.
[French, from Old French, from laver, to wash, from Latin lavāre; see leu(ə)- in the Appendix of Indo-European roots.]