The term FIRST-AID DEVICE is composed of two crossword solutions, SPLINT (6 letters) and COMPRESS (8 letters). A SPLINT is a device used to immobilize a broken bone or injured joint. It is usually made of metal, wood, or plastic and is applied to the affected area to keep it from moving. A COMPRESS is a piece of cloth or other material that is soaked in a liquid, such as water or antiseptic, and then applied to an injured area to reduce swelling and provide relief. Compresses are often used in first aid to treat minor injuries.