Having had grease, oil, or fatty substances removed; cleaned of grease.
From degrease (de- 'remove' + grease from Old French 'graisser') + -ed (past participle). This is a modern technical term in cleaning and manufacturing.
Industrial degreasing with solvents is crucial before metal parts are welded or coated—a single trace of grease can ruin entire manufacturing batches, so 'degreased' is a critical quality checkpoint.
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