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[an-uh-teys, -teyz] /ˈæn əˌteɪs, -ˌteɪz/
noun, Mineralogy
a naturally occurring crystalline form of titanium dioxide, TiO 2 .
Also called octahedrite.
1835-45; < French < Greek anátasis, equivalent to ana- ana- + ta- (variant stem of teínein to stretch) + -sis -sis Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for anatase
  • Pure anatase films consisted of epitaxial anatase surface particles on a continuous anatase film.
  • anatase-grade pigment is often used in the paper industry because it is less abrasive to papermaking machinery.
British Dictionary definitions for anatase


a rare blue or black mineral that consists of titanium oxide in tetragonal crystalline form and occurs in veins in igneous rocks. Formula: TiO2 Also called octahedrite
Word Origin
C19: from French, from Greek anatasis an extending (referring to the length of the crystals), from anateinein to stretch out
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Encyclopedia Article for anatase

one of three minerals composed of titanium dioxide (TiO2), the other two being rutile and brookite. It is found as hard, brilliant crystals of tetragonal symmetry and various colours in veins in igneous and metamorphic rocks and commonly in placer deposits of detritus. Notable vein deposits exist in many regions of the Alps; placer deposits are common in Minas Gerais and Bahia, Braz. Much anatase is formed by weathering of titanite, and it is itself altered to rutile; rutile paramorphs (replacements having the same outward shape) after anatase are common in the detrital deposits of Brazil and the Sanarka region of the Urals. For detailed physical properties, see oxide mineral (table)

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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