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proton
8 dictionary results for: proton
Dictionary.com Unabridged (v 1.1) - Cite This Source - Share This
pro·ton       [proh-ton] Pronunciation Key
–noun Physics, Chemistry.
a positively charged elementary particle that is a fundamental constituent of all atomic nuclei. It is the lightest and most stable baryon, having a charge equal in magnitude to that of the electron, a spin of 1/2 , and a mass of 1.673 × 10−27 kg. Symbol: P

[Origin: 1915–20; n. use of Gk prôton, neut. of prôtos first]

pro·ton·ic, adjective
American Heritage Dictionary - Cite This Source - Share This
pro·ton       (prō'tŏn')  Pronunciation Key 
n.   Abbr. p
A stable, positively charged subatomic particle in the baryon family having a mass 1,836 times that of the electron. See Table at subatomic particle.


[From Greek prōton, neuter of prōtos, first; see per1 in Indo-European roots.]

pro·ton'ic adj.
Online Etymology Dictionary - Cite This Source - Share This
proton 
1920, coined by Eng. physicist Ernest Rutherford (1871-1937) from Gk. proton, neut. of protos "first," supposedly because hydrogen was hypothesized as a constituent of all the elements. The word was used earlier in embryology (1893) at a transl. of Ger. anlage ("fundamental thing") based on Aristotle's phrase he prote ousia to proton.

WordNet - Cite This Source - Share This
proton

noun
a stable particle with positive charge equal to the negative charge of an electron 

The American Heritage Science Dictionary - Cite This Source - Share This
proton       (prō'tŏn')  Pronunciation Key 
A stable subatomic particle in the baryon family having a mass of 1.672 × 10-24 grams (1,836 times that of the electron) and a positive electric charge of approximately 1.602 × 10-19 coulombs. Protons make up part of the nucleus of all atoms except hydrogen, whose nucleus consists of a single proton. In neutral atoms, the number of protons is the same as the number of electrons. In positively charged atoms, the number of protons is greater than the number of electrons, and in negatively charged atoms electrons outnumber protons. Protons are believed to be composed of two up quarks and one down quark. See Table at subatomic particle.

American Heritage New Dictionary of Cultural Literacy, Third Edition - Cite This Source - Share This
proton [(proh-ton)]

An elementary particle with a positive charge, found in the nucleus of an atom.

Note: A proton is over a thousand times heavier than an electron.
Note: Protons and neutrons make up most of an atom's mass.

American Heritage Stedman's Medical Dictionary - Cite This Source - Share This

proton pro·ton (prō'tŏn')
n.
A stable, positively charged subatomic particle in the baryon family having a mass 1,836 times that of the electron.

Free On-line Dictionary of Computing - Cite This Source - Share This

PROTON
1. A home computer made by Acorn Computers under a contract won from the BBC in April 1981.
[Details?]
2. Something to do with Microsoft SoftLib?
(1994-11-28)

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