Plural of grinding; the particles or powder produced from grinding something, or multiple instances of grinding.
From 'grinding' (the act of grinding) with plural suffix '-s.' The word can refer either to the physical byproducts of grinding (like coffee grindings) or to multiple grinding actions.
Coffee shops produce thousands of pounds of 'grindings' every day—what we call 'grounds' is technically the plural of the gerund 'grinding,' which is why old coffee equipment sometimes labeled the waste receptacle as 'grindings tray.'
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