The crossword solution for the term 'STAR MATERIAL' is TIN, a three-letter word. TIN is a chemical element with the symbol Sn and atomic number 50. It is a malleable, ductile, silvery-white post-transition metal that is not easily oxidized in air. TIN is often used in alloys such as bronze and pewter, and has many uses in industry, including in solder, food cans, and other containers. TIN is also used to make stars for decorations, which is why it is referred to as 'STAR MATERIAL'.