GNU Collaborative International Dictionary of English

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  1.       

    { Dia- , Di- }. [Gr. διά through; orig., dividing into two parts; akin to  two. See Two, and cf. 1st Di-.] A prefix denoting through; also, between, apart, asunder, across. Before a vowel dia- becomes di-; as, diactinic; dielectric, etc.
    1913 Webster

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