Stretching muscle is a type of exercise that involves the lengthening of muscles and tendons in order to increase flexibility and range of motion. The three crossword solutions for this term are dilator (7 letters), tensor (6 letters), and tewor (5 letters). A dilator is a device used to widen or enlarge a body opening, such as a blood vessel or the cervix. A tensor is a muscle that contracts to produce tension in a part of the body, such as the neck or back. Lastly, a tewor is a type of muscle that is responsible for stretching and contracting the body's tissues.