Rubber/ˈrʌbər/ Definition 1 of 4Pro Tip 1/3Material Context Often used to describe items made from elastic materials that might stretch or bend. They used rubber hoses in the garden. Pro Tip 2/3Industrial Use Frequently found in manufacturing and industrial contexts for its durable qualities. The rubber seal prevents water from leaking. Pro Tip 3/3Not Always Natural Remember, 'rubber' can be either natural or synthetic, not necessarily from a tree. My boots are made with synthetic rubber.