chromium

A metallic element, atomic no. 24, atomic wt. 51.9961. A dietary essential bioelement. 51Cr (half-life of 27.70 days) is used as a diagnostic aid in many disorders ( e.g., gastrointestinal protein loss). [G. chroma, color]
- c. trioxide CrO3; chromic acid, a strong oxidizing agent used as a caustic in the removal of warts and other small growths from the skin and genitals; the hydrated acid, H2CrO4, forms variously colored salts with potassium, lead, and other bases.

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chro·mi·um 'krō-mē-əm n a blue-white metallic element found naturally only in combination and used esp. in alloys and in electroplating symbol Cr see ELEMENT (table)

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chro·mi·um (Cr) (kroґme-əm) [L., from Gr. chrōma color] a blue-white, brittle metal, atomic number 24, atomic weight 51.996, specific gravity 7.1; several of its compounds are pigments, and the metal itself is used for weather-resistant plating; it is also an important component of most base metal alloys used in dentistry. Chromium plays a role in glucose metabolism and is considered essential in trace amounts in nutrition. Hexavalent chromium is carcinogenic.

Medical dictionary. 2011.

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  • chromium — [krō′mē əm] n. [ModL < Fr chrome < Gr chrōma (see CHROMA) + IUM; so named (1797) by N. L. Vauquelin, Fr chemist, its discoverer, because of its bright colored compounds] a grayish white, crystalline, very hard, metallic chemical element… …   English World dictionary

  • Chromium — Chro mi*um, n. [NL., fr. Gr. ? color.] (Chem.) A comparatively rare element occurring most abundantly in the mineral chromite. Atomic weight 52.5. Symbol Cr. When isolated it is a hard, brittle, grayish white metal, fusible with difficulty. Its… …   The Collaborative International Dictionary of English

  • Chromium — (Chrommetall), so v. w. Chrom …   Pierer's Universal-Lexikon

  • chromium — Symbol: Cr Atomic number: 24 Atomic weight: 51.996 Hard silvery transition element. Used in decorative electroplating. Discovered in 1797 by Vauquelin …   Elements of periodic system

  • chromium — metallic element, 1807, with metallic elemental suffix ium + Fr. chrome, the name proposed for the new element by Fourcroy and Haüy, from Gk. chroma color (see CHROME (Cf. chrome)). So called for its colorful compounds. Related: Chromite …   Etymology dictionary

  • chromium — ► NOUN ▪ a hard white metallic chemical element used in stainless steel and other alloys …   English terms dictionary

  • Chromium — This article is about the chemical element. For other uses, see Chromium (disambiguation). vanadium ← chromium → manganese ↑ Cr ↓ Mo …   Wikipedia

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