An atom or group of atoms carrying an electric charge by virtue of having gained or lost one or more electrons. Ions charged with negative electricity (anions) travel toward a positive pole (anode); those charged with positive electricity (cations) travel toward a negative pole (cathode). Ions may exist in solid, liquid, or gaseous environments, although those in liquid (electrolytes) are more common and familiar. [G. i., going]
- aquo-i. aquo-i..
- dipolar ions ions possessing both a negative charge and a positive charge, each localized at a different point in the molecule, which thus has both positive and negative “poles”; amino acid s are the most notable dipolar ions, containing a positively charged NH3+ group and a negatively charged COO group at neutral pH. SYN: amphions, zwitterions.
- gram-i. gram-i..
- hydride i. the H i., transferred to acceptor molecules in some biologic oxidations.
- hydrogen i. (H+) a hydrogen atom minus its electron and therefore carrying a unit positive charge ( i.e., a proton); in water, it combines with a water molecule to form hydronium i., H3O+.
- hydronium i. the hydrated proton, H3O+, a form in which hydrogen i. exists in aqueous solutions; also, H3O+ H2O, H3O+ 2H2O, etc. SYN: oxonium i..
- oxonium i. SYN: hydronium i..
- sulfonium i. a compound in which a sulfur atom has three single covalent bonds and therefore has a positive charge analogous to the nitrogen of an ammonium compound; e.g., S-adenosyl-l-methionine.
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ischemic optic neuropathy

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ion 'ī-ən, 'ī-.än n
1) an atom or group of atoms that carries a positive or negative electric charge as a result of having lost or gained one or more electrons see ANION, CATION
2) a charged subatomic particle (as a free electron)

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an atom or group of atoms that has lost one or more electrons, making it electrically charged and therefore more chemically active. See anion, cation, electrolyte, ionization.

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(iґon) [Gr. iōn going] an atom or radical having a charge of positive (cation) or negative (anion) electricity owing to the loss or gain of one or more electrons. Substances that form ions are called electrolytes. See ionic theory, under theory. ionic adj

Medical dictionary. 2011.

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  • Ion — Ion …   Deutsch Wörterbuch

  • ion — ion·i·cism; ion·i·cize; ion·iza·tion; ion·o·gen; ion·o·gen·ic; ion·og·ra·phy; ion·o·pho·re·sis; ion·o·sphere; ion·oxalis; ion·to·pho·re·sis; man·dil·ion; meth·ion·ic; min·ion·ette; noc·to·vis·ion; opin·ion·able; opin·ion·al; opin·ion·at·ed;… …   English syllables

  • ION — steht für in der Chemie oder Physik ein Atom oder Molekül, das elektrisch geladen ist, siehe Ion eine deutsche Nachsilbe, siehe ion Ion ist ein männlicher Vorname, siehe Ion (Vorname) Ion oder ION sind Namen von Personen, Publikationen,… …   Deutsch Wikipedia

  • ion — [ jɔ̃ ] n. m. • 1840; angl. ion, du gr. ion, p. prés. de ienai « aller » ♦ Chim., phys. Atome ou molécule qui a perdu sa neutralité électrique par acquisition ou perte d un ou de plusieurs électrons. Ions positifs (⇒ cation) , négatifs (⇒ anion) …   Encyclopédie Universelle

  • Ion — 〈n. 27; Phys.; Chem.〉 elektr. geladenes Atom, Atomgruppe od. Molekül [<grch. ion, Part. Präs. von ienai „gehen“, eigtl. „wanderndes (Teilchen)“] * * * Ion [ i̯o:n, auch i:ɔn; griech. ión = Gehendes, Wanderndes (iénai = gehen, wandern)], das; s …   Universal-Lexikon

  • ion — IÓN, ioni, s.m. Atom, moleculă sau grupare de atomi care are un exces de sarcină electrică pozitivă sau negativă. [pr.: i on] – Din fr. ion. Trimis de gall, 14.02.2009. Sursa: DEX 98  IARBA SFÂNTULUI IÓN s. v. salvie de Etiopia. Trimis de siveco …   Dicționar Român

  • -ion — ist ein häufiges Suffix beim Substantiv, das der Wortbildung dient. Inhaltsverzeichnis 1 Herkunft aus dem Lateinischen 2 Herkunft aus dem Griechischen 3 Weblinks …   Deutsch Wikipedia

  • Iön — IÖN, ónis, Gr. ἸἼων, ωνος, (⇒ Tab. XXV.) des Xuthus und der Kreusa, einer Tochter des Erechtheus, Sohn, Apollod. l. I. c. 7. §. 2. Er dienete diesem seinem Großvater in dem Kriege wider die Eleusinier, als atheniensischer Feldherr und schlug… …   Gründliches mythologisches Lexikon

  • Ion — I on ([imac] [o^]n), n. [Gr. io n, neut, of iw n, p. pr. of ie nai to go.] 1. (Elec. Chem.) an atom or goup of atoms (radical) carrying an electrical charge. It is contrasted with neutral atoms or molecules, and free radicals. Certain compounds,… …   The Collaborative International Dictionary of English

  • Ion — Ion: ION  платформа для создания сверхкомпактных ПК от компании NVIDIA. Ion (менеджер окон)  фреймовый оконный менеджер для UNIX подобных операционных систем. Ion (группа) (исп. Íon) ирландская музыкальная группа, основана в 2005… …   Википедия

  • Ion — Sn (ein elektrisch geladenes Teilchen) per. Wortschatz fach. (19. Jh.) Neoklassische Bildung. Neubildung im Englischen (Faraday) zu gr. ión wandernd , dem neutralen PPräs. von gr. iénai gehen, wandern . Die so benannten Teilchen wandern bei der… …   Etymologisches Wörterbuch der deutschen sprache

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