coin
n. countablen. a small, flat, round piece of metal used as money. You can carry these in your pocket or a wallet to pay for things.
n. a flat, typically round piece of metal issued by a governmental authority for use as money.
I found a gold coin on the sidewalk today.
The vending machine only accepts exact change, so I need to find a one-dollar coin.
Archaeologists often use the minting dates on a coin found at an excavation site to establish a chronological baseline for the surrounding artifacts.
From Middle English coyn, from Old French coigne (“wedge, cornerstone, die for stamping”), from Latin cuneus (“wedge”). Doublet of coign and cuneus. See also quoin (“cornerstone”). Displaced Middle English mynt, from Old English mynet (whence modern English mint), which was derived from Latin monēta.