| 1. | Law. today's date. Origin: < L dē datō  |
| 2. | degree-day. |
| 3. | delayed delivery. |
| 4. | delivered. |
| 5. | demand draft. |
| 6. | double deck. |
| 7. | Shipbuilding. dry dock. |
| delivered. |
| days after date. |
| 1. | demand draft. |
| 2. | Doctor of Divinity. |
| Dungeons and Dragons. |
[di-gree-dey] 
| one degree of departure, on a single day, of the daily mean temperature from a given standard temperature. Abbreviation: dd |
| DD abbr.
|
| degree-day
A unit of measurement equal to a difference of one degree between the mean outdoor temperature on a certain day and a reference temperature. The unit is most often used in estimating the energy needs for heating or cooling a building (for example, heating degree-days and cooling degree-days). Originally, degree-days were used to determine the relationship between temperature and plant growth. The term continues to be used in life sciences as a measure of upper- and lower-temperature limits for organisms. |
DD
1.
2.
3.
(2005-01-26)
dd
A Unix copy command with special options suitable for block-oriented devices; it was often used in heavy-handed system maintenance, as in "Let's "dd" the root partition onto a tape, then use the boot PROM to load it back on to a new disk".
dd had a distinctly non-Unixy keyword option syntax reminiscent of IBM System/360 JCL (which had an elaborate DD "Dataset Definition" specification for I/O devices). Though the command filled a need, the interface design was clearly a prank.
[The Jargon File]
(2005-08-08)
DD
|
