Hook/hʊk/ Definition 1 of 6Pro Tip 1/2Physical Object The noun 'hook' often refers to a tangible object used for hanging items. Let's put up some hooks in the hallway for our bags. Pro Tip 2/2Not Always Metal 'Hooks' aren't always made of metal; they can be plastic or other materials. I bought a set of plastic hooks to hang my kitchen utensils.