noun, plural Y’s or Ys, y’s or ys.
- the 25th letter of the English alphabet, a semivowel.
- any spoken sound represented by the letter Y or y, as in yet, city, or rhythm.
- something having the shape of a Y.
- a written or printed representation of the letter Y or y.
- a device, as a printer’s type, for reproducing the letter Y or y.
- one septillionth (10-24) of a second. Abbreviation: ysec, ys
- The symbol for yttrium.