Merriam-Webster's Collegiate® Dictionary, 11th Edition
COIN
I. noun
Etymology: Middle English, from Anglo-French coing wedge, corner, from Latin cuneus wedge
Date: 14th century
1. archaic corner , cornerstone , quoin , wedge ,
2. a usually flat piece of metal issued by governmental authority as money, metal money, something resembling a coin especially in shape, something used as if it were money (as in verb al or intellectual exchange) , something having two different and usually opposing sides, money ,
II. transitive verb
Date: 14th century
1. to make (a coin) especially by stamping ; mint , to convert (metal) into coins, create , invent , coiner noun
III. adjective
Date: circa 1566
of or relating to coins, operated by coins