The term 'glutinous substance' can be broken down into three crossword solutions: GELATIN (7 letters), SIZE (4 letters), and ELATING (7 letters). GELATIN is a colorless and flavorless protein derived from animal collagen, commonly used as a gelling agent in food products such as jellies and desserts. SIZE is the physical dimensions of an object, which can vary depending on the type of glutinous substance. Elating is an emotion of joy or excitement, which can be experienced when consuming certain types of glutinous substances.