Dictionary
1d
noun, often capitalized often attributive \ˈdē\
: 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
plural d's or ds \ˈdēz\
Full Definition of D
1
a : the 4th letter of the English alphabet b : a graphic representation of this letter c : a speech counterpart of orthographic d
2
: five hundred — see number table
3
: the second tone of a C-major scale
4
: a graphic device for reproducing the letter d
5
: one designated d especially as the fourth in order or class
6
a : a grade rating a student's work as poor in quality 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
See d defined for English-language learners
See d defined for kids
ADVERTISEMENT
First Known Use of D
before 12th century
Rhymes with D
b, be, bee, c, cay, cee, Cree, dee, Dee, dree, e, fee, flea, flee, free, g, gee, ghee, glee, gree, he, key, Key, knee, lea, lee, me, mi, p, pea, pee, plea, pree, quay, re, Rhee, scree, sea, see, she, si, ski, spree, sri, t, tea, tee, the, thee, three, ti, tree, twee, Twi, v, vee, we, wee, whee, ye, z, zee
2d
abbreviation
Definition of D
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
drive; driving
1D
abbreviation
2D
symbol
Definition of D
deuterium
D Defined for Kids
d
noun , often cap \ˈdē\
plural d's or ds \ˈdēz\
Definition of D for Kids
1
: the fourth letter of the English alphabet
2
: 500 in Roman numerals
3
: a grade that shows a student's work is poor
4
: a musical note referred to by the letter D
Medical Dictionary
d
abbreviation
Medical Definition of D
1
dalton
2
date
3
daughter
4
day
5
dead
6
deceased
7
deciduous
8
degree
9
density
10
developed
11
deviation
12
dexter
13
diameter
14
died
15
diopter
16
disease
17
divorced
18
dorsal
19
dose
20
duration
Learn More About D
ADVERTISEMENT
Seen & Heard
What made you want to look up d? Please tell us where you read or heard it (including the quote, if possible).