Pronunciation: (dē), [key]
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.


Symbol, Biochem.(of a molecule) having a configuration resembling the dextrorotatory isomer of glyceraldehyde: always printed as a small capital, roman character (distinguished from l-). Cf. d-.


Symbol, Chem., Biochem.
dextrorotatory; dextro- (distinguished from l-). Cf. D-.


1. de (used in French names as an elided form of de): Charles Louis d'Albert.
2. di (used in Italian names as an elided form of di): Gabriele d'Annunzio.


Pron. Spelling.contraction of do or did before you: How d'you like your eggs cooked? D'you go to the movies last night?


1. contraction of had: I was glad they'd gone.
2. contraction of did: Where'd they go?
3. contraction of should or would: He'd like to go. I'd like to remind you of your promise.
4. contraction of -ed: She OK'd the plan.


1. Elect.debye.
2. deep.
3. depth.
4. Optics.diopter.
5. divorced.
6. Dutch.


1. the fourth in order or in a series.
2. (sometimes l.c.) (in some grading systems) a grade or mark, as in school or college, indicating the quality of a student's work as poor or barely passing.
3. (sometimes l.c.) a classification, rating, or the like, indicating poor quality.
4. Music.
a. the second tone in the scale of C major, or the fourth tone in the relative minor scale, A minor.
b. a string, key, or pipe tuned to this tone.
c. a written or printed note representing this tone.
d. (in the fixed system of solmization) the second tone of the scale of C major, called re.
e. the tonality having D as the tonic note.
5. (sometimes l.c.) the Roman numeral for 500. Cf. Roman numerals.
6. Chem.deuterium.
7. Elect.
a. electric displacement.
b. a battery size for 1.5 volt dry cells: diameter, 1.3 in. (3.3 cm); length, 2.4 in. (6 cm).
8. Biochem.aspartic acid.
9. a symbol for a shoe width size narrower than E and wider than C.
10. a proportional brassiere cup size larger than C.


1. day.
2. December.
3. Democrat.
4. Democratic.
5. Physics.density.
6. Deus.
7. Deuteronomy.
8. Doctor.
9. dose.
10. Dutch.


1. (in prescriptions) give.
2. date.
3. daughter.
4. day.
5. deceased.
6. deep.
7. degree.
8. delete.
9. Brit.pence.
10. Brit.penny.
11. Physics.density.
12. depth.
13. deputy.
14. dialect.
15. dialectal.
16. diameter.
17. died.
18. dime.
19. dividend.
20. dollar; dollars.
21. dose.
22. drachma.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.



Related Content