Cork/kɔːrk/ Definition 1 of 3Pro Tip 1/3Material Origin Cork is a sustainable natural material from the bark of cork oaks. Cork for wine bottles is harvested from trees without harm. Pro Tip 2/3Common Usage Besides wine bottles, cork is used in notice boards and flooring. She pinned the note onto the cork board above her desk. Pro Tip 3/3Cultural Significance Popping a cork from a bottle often signifies celebration. They popped the cork of a champagne bottle on New Year's Eve.