• synonyms


[rey-see-mik, -sem-ik, ruh-]
adjective Chemistry.
  1. noting or pertaining to any of various organic compounds in which racemism occurs.
Show More

Origin of racemic

1830–40; < French racémique < Latin racēm(us) raceme + French -ique -ic
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for racemic

Historical Examples of racemic

  • In the one case, therefore, the racemic compound has a higher, in the other a lower melting point than the active forms.

    The Phase Rule and Its Applications

    Alexander Findlay

  • The lower isothermal, on the other hand, would be obtained at a temperature at which the racemic compound could be formed.

  • As, for instance, strychnine racemate, a compound of racemic acid with the optically active strychnine.

  • Racemic acid is rather less soluble than tartaric, and separates first from a solution containing the two acids.

  • A solution of racemic acid precipitates a neutral salt of calcium, which is not the case with tartaric acid.

British Dictionary definitions for racemic


  1. chem of, concerned with, or being a mixture of equal amounts of enantiomers and consequently having no optical activity
Show More
Derived Formsracemism (ˈræsɪˌmɪzəm, rəˈsiːmɪzəm), noun

Word Origin for racemic

C19: from raceme (as in racemic acid) + -ic
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

racemic in Medicine


(rā-sēmĭk, -sĕmĭk, rə-)
  1. Of or relating to a chemical compound that contains equal quantities of dextrorotatory and levorotatory forms and therefore does not rotate the plane of incident polarized light.
Show More
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

racemic in Science


  1. Relating to a chemical compound that contains equal quantities of the dextrorotatory and levorotatory forms of the compound and therefore does not rotate the plane of incident polarized light.
  2. Relating to or consisting of racemes.
Show More
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.