Dictionary.net

the 26th letter of the Roman alphabet; "the British call Z zed and the Scots call it ezed but Americans call it zee"; "he doesn't know A from izzard"

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.

The twenty-sixth letter in the English alphabet.

Is the last letter of the English alphabet, and is merely a vocal S.

The twenty-sixth and last letter of the English alphabet is a sibilant consonant, and is merely a sonant or vocal. In Italian and German it is a double consonant, or has a compound sound of dz or ds. But in English it has one uniform sound, as in haze, maize, which bears the same relation to s that v does to f, that of vocal as constrasted with an aspirate articulation.