The term 'rubbery stuff' can be summarized by the crossword solution of 'LATEX'. LATEX is a milky sap-like substance that is found in many plants, and is used to make a variety of products such as rubber, paint, and adhesives. It is also used in medical and dental applications, such as gloves and balloons. LATEX is a natural polymer that is highly elastic and durable, making it an ideal material for many products.