DIA
\dˈa͡ɪə], \dˈaɪə], \d_ˈaɪ_ə]\
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in composition, 'through, asunder, out of, separated. When prefixed to any therapeutical agent, it meant, in ancient pharmacy, a preparation into which that agent entered.
By Robley Dunglison
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A prefix derived from the old Greek phrases in which the preposition, dia, through, during, across, was used. Later these phrases were treated as words by Latin physicians, e. g., diachylaine, from diachylon, a medicament composed of juices.
By Smith Ely Jelliffe