Hypertext Webster Gateway: "Dia"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Dia- \Di"a-\, Di- \Di-\ . [Gr. dia` 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.
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