negative ion

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negative ion

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–noun Physics, Chemistry.

See under ion (def. 1).

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i⋅on

[ahy-uh

n, ahy-on]

–noun Physics, Chemistry.

an electrically charged atom or group of atoms formed by the loss or gain of one or more electrons, as a cation (positive ion), which is created by electron loss and is attracted to the cathode in electrolysis, or as an anion (negative ion), which is created by an electron gain and is attracted to the anode. The valence of an ion is equal to the number of electrons lost or gained and is indicated by a plus sign for cations and a minus sign for anions, thus: Na⁺, Cl−, Ca⁺⁺, S⁼.

2.	one of the electrically charged particles formed in a gas by electric discharge or the like.

Origin:
< Gk ión going, neut. prp. of iénai to go; term introduced by Michael Faraday in 1834

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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Cultural Dictionary

ion [(eye-uhn, eye-on)]

An atom that has either lost or gained one or more electrons, so that it has an electrical charge. Ions can be either positively or negatively charged.

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Word Origin & History

ion

1834, introduced by Eng. physicist and chemist Michael Faraday (suggested by William Whewell), coined from Gk. ion, neut. prp. of ienai "go," from PIE base *ei- "to go, to walk" (cf. Gk. eimi "I go;" L. ire "to go," iter "a way;" O.Ir. ethaim "I go;" Ir. bothar "a road" (from *bou-itro- "cows' way"), Gaulish eimu "we go," Goth. iddja "went," Skt. e'ti "goes," imas "we go," ayanam "a going, way;" Avestan ae'iti "goes;" O.Pers. aitiy "goes;" Lith. eiti "to go;" O.C.S. iti "go;" Bulgarian ida "I go;" Rus. idti "to go"). So called because ions move toward the electrode of opposite charge. Ionosphere coined 1926 by R.A. Watson-Watt.

Online Etymology Dictionary, © 2001 Douglas Harper
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Medical Dictionary

Main Entry: ion
Pronunciation: 'I-&n, 'I-"än
Function: noun
1 : an atom or group of atoms that carries a positive or negative electriccharge as a result of having lost or gained one or more electrons —see ANION, CATION
2 : a charged subatomic particle (as a free electron)

Merriam-Webster's Medical Dictionary, © 2002 Merriam-Webster, Inc.
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Medical Dictionary

ion i·on (ī'ən, ī'ŏn')
n.
An atom or a group of atoms that has acquired a net electric charge by gaining or losing one or more electrons.

Science Dictionary

ion (ī'ən, ī'ŏn') Pronunciation Key
An atom or a group of atoms that has an electric charge. Positive ions, or cations, are formed by the loss of electrons; negative ions, or anions, are formed by the gain of electrons.

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