v. t. 1. To clean the oil from (wool) after combing. Ash. [ 1913 Webster ]
2. (Chem.) To clean (a filter, a chromatography column, a water softener, etc.) by passing liquid through in the reverse of the normal direction of flow. This procedure dislodges particles which clog the pores of the filter or column packing, removing them from the filter or column. [ PJC ]
[ひきなみ, hikinami](n) (1) (See 寄せ波) backwash; rip current; undertow; (2) stern wave; (3) (See 押し波) drawback (of a tsunami, i.e. when a wave trough reaches land before a crest)[Add to Longdo]