The term 'blood vessel dilator' refers to a medical device or procedure used to widen a blood vessel. The two crossword solutions for this term are 'amyl' (4 letters) and 'stent' (5 letters). Amyl is a type of alcohol that is used as a vasodilator, meaning it relaxes the walls of the blood vessels and increases blood flow. A stent is a small tube-like device that is inserted into a blood vessel to keep it open and allow for increased blood flow. Both amyl and stents are used to treat conditions such as coronary artery disease and peripheral artery disease.