Pronunciation: (zē or, esp. Brit., zed; Archaic iz'urd), [key]
—pl. Z's or Zs, z's or zs.
1. the 26th letter of the English alphabet, a consonant.
2. any spoken sound represented by the letter Z or z, as in zero, zigzag, or buzzer.
3. something having the shape of a Z.
4. a written or printed representation of the letter Z or z.
5. a device, as a printer's type, for reproducing the letter Z or z.
1. Astron.zenith distance.
1. the 26th in order or in a series, or, when I is omitted, the 25th.
2. (sometimes l.c.) the medieval Roman numeral for 2000. Cf. Roman numerals.
3. Chem., Physics.atomic number.
1. an unknown quantity or variable.
2. (in Cartesian coordinates) the z-axis.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.