Medical occupancy for widen of a blood vessel ?

What is the medical term for widening of a blood vessel? Would it be vasodilator i know that vaso means vessel make wider! but the term i have for vasodilator says a rudeness or agent that causes dilation of blood vessel and thats not what is ask it ask what A widening of a blood vessel i am so unsure!!
Answers:
Go with vasodilation.
yes step with with it since dilation means enlarge as in are your eyes dilated yet yes that is what it finances
Vasodilator is the agent (eg hormone/drug) that causes the process of VASODILATION.
vasodilation

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