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d

noun, often capitalized, often attributive
\ ˈdē How to pronounce d (audio) \
plural d's or ds\ ˈdÄ“z How to pronounce ds (audio) \

Definition of d

 (Entry 1 of 6)

1a : the 4th letter of the English alphabet Her middle initial is d.
b : a graphic representation of this letter a half moon in the shape of a d
c linguistics : the speech sound that the written letter d represents : a speech counterpart of orthographic d
2 Roman numerals : five hundred — see Table of Numbers
3 music : the second tone of a C-major scale (see scale entry 6 sense 2) in the key of d
4 : a graphic device for reproducing the letter d the d on my computer keyboard
5 : one designated d especially as the fourth in order or class option d

6 education

a : a grade rating a student's work as poor in quality got a d on the test
b : one graded or rated with a D
7 : something shaped like the letter D specifically : a semicircle on a pool table about 23 inches in diameter for use especially in snooker

8 capitalized, sports

a : defense sense 2b play tough D
b : defense sense 4b

d

abbreviation (1)

Definition of d (Entry 2 of 6)

1 date
2 daughter
3 day
4 dead; deceased
5 deci-
6 degree
7 [ Latin denarius, denarii ] penny; pence
8 depart; departure
9 diameter
10 differential
11 dimensional
12 distance
13 dorsal
14 down (see down entry 5 sense 6)
15 drive; driving

D

abbreviation (2)

Definition of D (Entry 3 of 6)

1 Democrat
2 derivative
3 dollar
4 Dutch

D

symbol (1)

Definition of D (Entry 4 of 6)

deuterium

d-

prefix
\ ˌdē, ˈdē\

Definition of d- (Entry 5 of 6)

1 : dextrorotatory d-tartaric acid
2 : having a similar configuration at a selected carbon atom to the configuration of dextrorotatory glyceraldehyde —usually printed as a small capital d-fructose

-d

symbol (2)

Definition of -d (Entry 6 of 6)

—used after the figure 2 or 3 to indicate the ordinal number second or third 2d53d

Examples of d in a Sentence

Noun

 Many people who are learning to read confuse b's and d's. names that start with d The song is in the key of D. She got a D on her chemistry test.
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First Known Use of d

Noun

before the 12th century, in the meaning defined at sense 1a

History and Etymology for d

Prefix

International Scientific Vocabulary, from dextr-

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More Definitions for d

d

noun
How to pronounce -d (audio)

English Language Learners Definition of d

: the fourth letter of the English alphabet
: a musical note or key referred to by the letter D : the second tone of a C-major scale
: a grade that is given to a student for doing poor work

See the full definition for d in the English Language Learners Dictionary

d

noun, often capitalized
\ ˈdē How to pronounce d (audio) \
plural d's or ds\ ˈdÄ“z \

Kids Definition of d

1 : the fourth letter of the English alphabet

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