Plural of 'emery,' referring to multiple pieces of emery paper, boards, or the mineral substance used for grinding, polishing, or sharpening.
From emery (Middle French émeri, Greek smiris). The plural adds '-ies' to the base form, following English pluralization rules for words ending in -y.
Emery is a naturally occurring mineral made mostly of corundum, the same substance that makes rubies and sapphires—so you might literally be polishing with crushed gemstones!
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