pro·ton 
(prōtŏn′)
(prōtŏn′)n. Abbr. p
The stable, positively charged nucleon, having a mass 1,836 times that of an electron and being a baryon composed of two up quarks and one down quark. The proton is a basic component of all atomic nuclei and the nucleus of the protium isotope of hydrogen.
[From Greek prōton, neuter of prōtos, first; see per1 in the Appendix of Indo-European roots.]
pro·tonic adj.
- neuropathologic
- neuropathological
- neuropathologist
- neuropathology
- neuropathy
- neuropeptide
- neuropharmacological
- neuropharmacologist
- neuropharmacology
- neurophysiologic
- neurophysiological
- neurophysiologist
- neurophysiology
- neuroplastic
- neuroplasticity
- neuropsychiatric
- neuropsychiatrist
- neuropsychiatry
- neuropsychological
- neuropsychologist
- neuropsychology
- neuropteran
- neuropterous
- neuroradiological
- neuroradiologist