WordReference Random House Unabridged Dictionary of American English © 2017
  • a combining form meaning "god,'' used in the formation of compound words:theocrat.
  • Also,[esp. before a vowel,] the-. 
    • Greek, combining form of theós

    Collins Concise English Dictionary © HarperCollins Publishers::

    theo-, (before a vowel)the- combining form
    1. indicating God or gods: theology
    Etymology: from Greek theos god

    'theo-' also found in these entries:

    Word of the day: task | reek


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