/dee/ , n. , pl. D's or Ds, d's or ds .
1. the fourth letter of the English alphabet, a consonant.
2. any spoken sound represented by the letter D or d, as in dog, ladder, ladle, or pulled.
3. something having the shape of a D.
4. a written or printed representation of the letter D or d.
5. a device, as a printer's type, for reproducing the letter D or d.