d — ODE · Shobdo

d /diː

▸ abbreviation

1 (in genealogies) daughter:

Henry m. Georgina 1957, 1s 2d.

2 day(s):

orbital period (Mars): 687.0 d.

3 [in combination] (in units of measurement) deci-.

4 (in travel timetables) departs:

Plymouth d 0721.

5 (d.) died (used to indicate a date of death):

Barents, Willem (d.1597).

6 British English penny or pence (of pre-decimal currency):

£20 10s 6d.

[from Latin denarius ‘penny’]

7 Chemistry denoting electrons and orbitals possessing two units of angular momentum:

d-electrons.

[ d from diffuse, originally applied to lines in atomic spectra]

▸ symbol

1 Mathematics diameter:

the circumference of a circle is expressed by the formula πd.

2 Mathematics denoting a small increment in a given variable:

dy/dx.