A button is a fastener that joins two pieces of fabric together by slipping through a loop or by sliding through a buttonhole. In modern clothing and fashion design, buttons are commonly made of plastic but also may be made of metal, wood, or seashell.
BUTTON meaning: 1 : a small, usually round piece of plastic, glass, metal, etc., that is sewn to a piece of clothing and is pushed through a loop or hole to fasten one part of the clothing to another part; 2 : a small, usually round sign that has a picture or words on the front and a pin on the back