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The Collaborative International Dictionary of English v.0.48 (gcide)

Z \Z\ (z[=e]; in England commonly, and in America sometimes,
z[e^]d; formerly, also, [i^]z"z[e^]rd)
Z, the twenty-sixth and last letter of the English alphabet,
is a vocal consonant. It is taken from the Latin letter Z,
which came from the Greek alphabet, this having it from a
Semitic source. The ultimate origin is probably Egyptian.
Etymologically, it is most closely related to s, y, and j; as
in glass, glaze; E. yoke, Gr. ?, L. yugum; E. zealous,
jealous. See Guide to Pronunciation, [sect][sect] 273, 274.
[1913 Webster]