adjective
Definition: Relating to or requiring the use of metal money, such as coins, for operation or function.
Example: The coin-operated machine only accepts quarters.
noun
Definition: A small, flat, round piece of metal that is used as money.
Example: I found a coin on the sidewalk while walking to the store.
transitive verb
Definition: To create a new word or phrase, or to produce money from metal.
Example: The artist decided to coin a new term for her unique style of painting.