. "In condensed matter physics and materials science, an amorphous (from the Greek a, without, morph\u00E9, shape, form) or non-crystalline solid is a solid that lacks the long-range order characteristic of a crystal. In some older books, the term has been used synonymously with glass. Nowadays, \"amorphous solid\" is considered to be the overarching concept, and glass the more special case: A glass is an amorphous solid that exhibits a glass transition. Polymers are often amorphous."@en . .