from The American Heritage® Dictionary of the English Language, 4th Edition

  • Two; twice; double: dichromatic.
  • Containing two atoms, radicals, or groups: dichloride.
  • Variant of dia-.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • Meaning two, twice, or double.
  • An occasionally used form of dis-.
  • A form of dia- before a vowel.

from the GNU version of the Collaborative International Dictionary of English

  • A prefix, signifying twofold, double, twice.


Greek; see dwo- in Indo-European roots.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From Ancient Greek δίς (dis, "twice"). (Wiktionary)
From Ancient Greek δία (dia, "through"). (Wiktionary)


  • I think pragmatically the politics are such that we would be wise to resist grants and/or contracts directly to ACORN, Inc. but try and either set up separate corporations … or use existing corporations … that are less overtly moving the money di- rectly into ACORN, Inc., though in truth it would be going there in other ways.


  • The aroma of asafoetida is due to a complex mixture of sulfur compounds, a dozen identical with volatiles in the onion family, and a number of less common di-, tri-, and tetrasulfides.

    On Food and Cooking, The Science and Lore of the Kitchen


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