[ 'skavɪn(d)ʒ ]
■ verb
1》 search for and collect (anything usable) from discarded waste.
↘search for (carrion) as food.
2》 remove (combustion products) from an internal-combustion engine cylinder on the return stroke of the piston.
3》 Chemistry combine with and remove (molecules, radicals, etc.) from a particular medium.
Origin
C17 (in the sense 'clean out'): back-form. from ~r .