neurologist -
A doctor or scientist who practices or specializes in neurology.
Wikipedia
Neurology is the medical field that specializes in neurology, the study of the human nervous system. The nervous system is comprised of the brain, spinal cord, nerves, and muscles. It can be affected by debilitating diseases, such as Parkinson’s and Alzheimer's, as well as by mental disorders such as schizophrenia, depression, autism, and Attention-deficit hyperactivity disorder(ADHD).
OmegaWiki Dictionary
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neurologist Medical specialist in neurology (the function and disease of the nerves and brain).