A vasodilator is a substance that causes blood vessels in the body to grow slightly wider by relaxing the smooth muscle[?] in the vessel wall. This will reduce blood pressure (since there is more room for the blood) and might allow blood to flow around a clot. Several vasodilators are used as drugs.
... de Soto, (died 1542), explorer
Bartolomeu Dias, (1450-1500), Portuguese explorer who first rounded the Cape of Good Hope.
Sir Francis Drake, (c. 1540-1596), pirate, ...