BACKWASHING

Etymology

Noun

backwashing (plural backwashings)

A form of water treatment in which water is pumped backwards through the filter media, sometimes with intermittent use of compressed air.

Source: Wiktionary

BACKWASH

Back"wash`, v. i.

Definition: To clean the oil from (wood) after combing.

Source: Webster’s Unabridged Dictionary 1913 Edition

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