z made with a tail (3) resembles the old terminal mark 3, indicating a contraction—as vi3. a contraction of vi[delicet]; quib3, a contraction of quibus; s3, a contraction of sed (but), and so on.
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Entry taken from Dictionary of Phrase and Fable, edited by the Rev. E. Cobham Brewer, LL.D. and revised in 1895.
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