D, d

[dee]
|

noun, plural D's or Ds, d's or ds.

the fourth letter of the English alphabet, a consonant.
any spoken sound represented by the letter D or d, as in dog, ladder, ladle, or pulled.
something having the shape of a D.
a written or printed representation of the letter D or d.
a device, as a printer's type, for reproducing the letter D or d.

D

Electricity. debye.
Optics. diopter.
divorced.

D

Symbol.

the fourth in order or in a series.
(sometimes lowercase) (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.
(sometimes lowercase) a classification, rating, or the like, indicating poor quality.
Music.
  1. the second tone in the scale of C major, or the fourth tone in the relative minor scale, A minor.
  2. a string, key, or pipe tuned to this tone.
  3. a written or printed note representing this tone.
  4. (in the fixed system of solmization) the second tone of the scale of C major, called re.
  5. the tonality having D as the tonic note.
(sometimes lowercase) the Roman numeral for 500.Compare Roman numerals.
Chemistry. deuterium.
Electricity.
  1. electric displacement.
  2. a battery size for 1.5 volt dry cells: diameter, 1.3 inches (3.3 cm); length, 2.4 inches (6 cm).
Biochemistry. aspartic acid.
a symbol for a shoe width size narrower than E and wider than C.
a proportional brassiere cup size larger than C.

d-

Symbol, Chemistry, Biochemistry.

dextrorotatory; dextro- (distinguished from l-).
Compare d-.

d.

1

(in prescriptions) give.

Origin of d.

1
From the Latin word

d.

2

British. pence.

Origin of d.

2
From the Latin word denāriī

d.

3

'd

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

D.

d-

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

d'

1

preposition

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

d'

2

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

in d.

(in prescriptions) daily.

Origin of in d.

From the Latin word in diēs
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for d

Contemporary Examples of d

Historical Examples of d

  • When you solve a sum you go from "a" to "b" and from "b" to "c" and from "c" to "d" and so on.

    Ancient Man

    Hendrik Willem van Loon

  • About half-way home George suddenly shouted, "D——d if I don't do it too!"

  • Put it in your pipe, my man,—put it in your pipe—not worth a d—-!

    Night and Morning, Complete

    Edward Bulwer-Lytton

  • But those d—-d fellows learn of the mad doctors how to tame us.

    Night and Morning, Complete

    Edward Bulwer-Lytton

  • D--n the rogues; I thought at one time they had me in a category!

    Homeward Bound

    James Fenimore Cooper


British Dictionary definitions for d

d

D

noun plural d's, D's or Ds

the fourth letter and third consonant of the modern English alphabet
a speech sound represented by this letter, usually a voiced alveolar stop, as in dagger
the semicircle on a billiards table having a radius of 11 1/2 inches and its straight edge in the middle of the baulk line

d

symbol for

physics density or relative density
maths a small increment in a given variable or function: used to indicate a derivative of one variable with respect to another, as in d y /d x

D

symbol for

music
  1. a note having a frequency of 293.66 hertz (D above middle C) or this value multiplied or divided by any power of 2; the second note of the scale of C major
  2. a key, string, or pipe producing this note
  3. the major or minor key having this note as its tonic
chem deuterium
maths the first derivative of a function, as in D(x ³ + x ²) = 3 x ² + 2 x
physics
  1. dispersion
  2. electric displacement
aeronautics drag
  1. a semiskilled or unskilled manual worker, or a trainee or apprentice to a skilled worker
  2. (as modifier)D worker See also occupation groupings
(Roman numeral) 500See Roman numerals

abbreviation for

Germany (international car registration)
  1. Australian informaldefenceI'm playing D in the match this afternoon
  2. Australian informaldefensive play

Word Origin for D

(for sense 8) from German Deutschland

D

D.

abbreviation for

Deutsch: indicating the serial number in the catalogue (1951) of the musical compositions of Schubert made by Otto Deutsch (1883–1967)

d.

abbreviation for

(in animal pedigrees) dam
daughter
British currency penny or pennies
diameter
died
dinar(s)
dollar(s)
drachma(s)

Word Origin for d.

(sense 3 and 6) Latin denarius

D.

abbreviation for

US politics Democrat(ic)
government Department
dinar(s)
Don (a Spanish title)
Duchess
Duke
(in the US and Canada) Doctor

'd

contraction of

would or hadI'd; you'd
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for d

D

fourth letter of the Roman alphabet, from Greek delta, from Phoenician and Hebrew daleth, pausal form of deleth "door," so called from its shape. The sign for "500" in Roman numerals. 3-D for "three-dimensional" is attested from 1953.

Online Etymology Dictionary, © 2010 Douglas Harper

d in Medicine

in d.

abbr.

in dies (daily)

d-

pref.

Relating to the configuration of d-glyceraldehyde, a compound chosen as the basis for stereochemical nomenclature because it is the simplest carbohydrate that can form optical isomers:d-fructose.

D.

abbr.

diopter
dose

d-

pref.

To the right; dextro:d-tartaric acid.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

d in Science

d

Abbreviation of diameter
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.