Dictionary Home » Dictionary Definitions » d

d

Listen See in a sentence

The definition of d is the fourth letter in the English alphabet.

(noun)

An example of d is the first letter of the word "down."

See d in Webster's New World College Dictionary

or D

noun pl. d's, D's

the fourth letter of the English alphabet: from the Greek delta, a borrowing from the Phoenician
any of the speech sounds that this letter represents, as, in English, the (d) of dog
a type or impression for d or D
the fourth in a sequence or group
an object shaped like

adjective

of d or D
fourth in a sequence or group
shaped like

dam (in pedigrees)
date
daughter
day(s)
dead
deci-
degree
Physics density
departs
departure
diameter
died
Physics distance
division
dollar
dorsal
dose
dyne(s)
Origin: L da
Pharmacy give
Origin: L denarius, pl. denarii
penny; pence

noun

a Roman numeral for 500; with a superior bar (), 500,000 or less often, 5,000
☆ Educ. a grade indicating below-average work, or merely passing
Music
1. the second tone or note in the ascending scale of C major
2. a key, string, etc. producing this tone
3. the scale having this tone as the keynote

adjective

below average in quality

dairy: prepared according to kashrut or kosher laws
December
Democrat
Democratic
Chem. deuterium
digital
drive (on automotive automatic-shift indicators)
Doctor
Don
Duchess
Duke
Dutch
Origin: L Dominus
Lord

dextrorotatory: usually printed in italic type [d-limonene] or, now, symbolized by a plus sign (+)

having an asymmetrical, right-handed spatial arrangement of atoms: usually printed as a small capital: D-glucose

do: d'you know the story?

had: I'd seen it before
would or should: we said we'd help
did: how'd you get here?

-ed used

esp. in old poetry, to indicate a nonsyllabic ending: foster'd
to spell the inflected forms of some words, esp. initialisms: mascara'd, OD'd

See d in American Heritage Dictionary 4

or D

noun pl. d's d's or D's also ds or Ds

The fourth letter of the modern English alphabet.
Any of the speech sounds represented by the letter d.
The fourth in a series.
Something shaped like the letter D.
D The lowest passing grade given to a student in a school or college.
Music
a. The second tone in the scale of C major or the fourth tone in the relative minor scale.
b. A key or scale in which D is the tonic.
c. A written or printed note representing this tone.
d. A string, key, or pipe tuned to the pitch of this tone.

abbreviation

deuteron
diameter
differential
down quark

The symbol for the isotope deuterium.
also d The symbol for the Roman numeral 500.

abbreviation

dative
day
Democrat
down

abbreviation

Zoology dam
date
daughter
died
dose
Chiefly British penny (112 of a shilling)

abbreviation

diopter
Don (title)
duchess
duke

The symbol for dextrorotatory.

In biochemistry, a symbol used as a prefix to indicate the spatial configuration of certain organic compounds with asymmetric carbon atoms. It is used if an organic compound has a configuration about an asymmetric carbon atom analogous to that of D-glyceraldehyde (the arbitrarily chosen standard), in which the hydroxy (OH) functional group is on the right side of the asymmetric carbon atom.

Origin:

Origin: From dextrorotatory