A merchant or trader, especially one who buys goods in bulk to sell to retailers, or a dealer in spices and dry goods.
From Old French 'grossier', derived from 'grosse' (bulk, wholesale), which comes from Latin 'grossus' (thick, coarse), referring to wholesale trading of large quantities.
A grosser was the middleman of medieval commerce—they'd buy spices by the ton from distant lands and resell to local shopkeepers, making them some of the earliest supply chain managers!
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