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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.
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Other definitions for 'd (2 of 12)

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.

Other definitions for 'd (3 of 12)

d'2

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

Other definitions for 'd (4 of 12)

D1

or d

[ dee ]
/ di /

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.

Other definitions for 'd (5 of 12)

D2

abbreviation
Electricity. debye; debyes.
deep.
depth.
divorced.

Other definitions for 'd (6 of 12)

D3

Symbol.

Other definitions for 'd (7 of 12)

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-.

Other definitions for 'd (8 of 12)

d-

Symbol, Chemistry, Biochemistry.
dextrorotatory; dextro- (distinguished from l-).
Compare d-.

Other definitions for 'd (9 of 12)

d.1

abbreviation
(in prescriptions) give.

Origin of d.

1
From the Latin word

Other definitions for 'd (10 of 12)

d.2

abbreviation
British. pence.

Origin of d.

2
From the Latin word denāriī

Other definitions for 'd (11 of 12)

d.3

abbreviation

Other definitions for 'd (12 of 12)

D.

abbreviation
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

How to use 'd in a sentence

British Dictionary definitions for 'd (1 of 7)

d

D

/ (diː) /

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

British Dictionary definitions for 'd (2 of 7)

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

British Dictionary definitions for 'd (3 of 7)

'd

contraction of
would or hadI'd; you'd

British Dictionary definitions for 'd (4 of 7)

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)

British Dictionary definitions for 'd (5 of 7)

D

symbol for
abbreviation for
Germany (international car registration)
  1. Australian informal defenceI'm playing D in the match this afternoon
  2. Australian informal defensive play

Word Origin for D

(for sense 8) from German Deutschland

British Dictionary definitions for 'd (6 of 7)

d.

abbreviation for

Word Origin for d.

(sense 3 and 6) Latin denarius

British Dictionary definitions for 'd (7 of 7)

D.

abbreviation for
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

Medical definitions for 'd (1 of 5)

D 11

The symbol for the isotope deuterium.

Medical definitions for 'd (2 of 5)

D 22

abbr.
dexter
diffusing capacity
dead space

Medical definitions for 'd (3 of 5)

d-

pref.
To the right; dextro:d-tartaric acid.

Medical definitions for 'd (4 of 5)

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.

Medical definitions for 'd (5 of 5)

D.

abbr.
diopter
dose
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

Scientific definitions for 'd

d

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