A person, device or substance that stimulates.(noun)
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Use "stimulator" in a sentence
"BTW - The reason there has been no MRI is because Terri Schiavo had a intrathalmic I believe that is the term stimulator implanted early in her treatment."
"Benlysta is a bioengineered antibody that blocks a protein called BLyS, or B-lymphocyte stimulator, which is elevated in lupus and other autoimmune diseases and is believed to contribute to production of cells that attack blood vessels and other healthy tissue."
"Doctors had a spinal cord stimulator, which is an electronic device, implanted in her body."