'Parkinson's disease' definitions:

Definition of 'Parkinson's disease'

noun

A degenerative disorder of the central nervous system characterized by tremor and impaired muscular coordination [syn: paralysis agitans, Parkinsonism, Parkinson's disease, Parkinson's syndrome, Parkinson's, shaking palsy]

From: GCIDE

Palsy \Pal"sy\, n.; pl. Palsies. [OE. palesie, parlesy, OF. paralesie, F. paralysie, L. paralysis. See Paralysis.] (Med.) Paralysis, complete or partial. See Paralysis. "One sick of the palsy." --Mark ii. 3. [1913 Webster]
Bell's palsy, paralysis of the facial nerve, producing distortion of one side of the face; -- so called from Sir Charles Bell, an English surgeon who described it.
Scrivener's palsy. See Writer's cramp, under Writer.
Shaking palsy, (Med.) paralysis agitans, a disease usually occurring in old people, characterized by muscular tremors and a peculiar shaking and tottering gait; now called parkinsonism, or Parkinson's disease. [1913 Webster +PJC]

From: GCIDE

Parkinson's \Parkinson's\, Parkinson's disease \Parkinson's disease\prop. n. A disease causing parkinsonism, a degenerative nervous disorder; sometimes used loosely as a synonym for parkinsonism. More precisely, parkinson's disease is the term for the underlying physiological disorder and parkinsonism is the term for the set of symptoms associated with the disease. See parkinsonism.
Syn: paralysis agitans, Parkinsonism, Parkinson's disease syndrome, shaking palsy. [WordNet 1.5]
Parkinson's disease is the most common form of parkinsonism, a group of disorders that are the result of the loss of dopamine-producing brain cells. --Mayo Clinic (Report, 1999) [PJC]
According to the National Parkinson's Foundation (NPF), 1 million Americans -- including former heavyweight boxing champion Muhammad Ali, U.S. Attorney General Janet Reno, and television and film star Michael J. Fox -- are affected by Parkinson's disease. --Mayo Clinic (Report, 1999) [PJC]