DARPA  an American agency which, in part, originated  the internet.

Deacon  A title for a leader in a variety of churches.  Also used to instill implacability in a good or bad guy, i.e. he's the Deacon of Doom.

Death Dealer  Probably one of the most memorable works of fantasy artist Frank Frazetta.  sample

Doom (and II)   One of the first really good first person shoot'em up games for the PC.  A new graphics paradigm was invented just for this game.  And used in subsequent others.

Door  Something that blocks a hole made in something else.  Can have magical properties.

Doughnut  A sugary confection that may yet be the downfall of mankind.

Drew Carey Show, The   TV Show. Situation comedy starring Drew Carey. An interesting plot twist is Drew's older cross-dressing brother falls in love with marries and has a child with Drew's nemesis at work, Mimi. Watch the reruns.

DVD  Digital Video Disk; Digital Versatile Disk. The next step up from the compact disk. As more and more types of data were stored on CDs, i.e. music, snippets of TV shows and Movies, and as a more permanent form of media distribution was sought by the media industries of film and TV, and as the physical amount of "permanent" digital computer data grew, new method of storing that information in larger, more cost effective means was necessary. Thus the DVD. The method is the same as for CD, i.e. a spinning disk with reflective and non-reflective pits representing binary data, but the technique is different. Finer focused laser beam, more control of the location of the beam, etc. With the advent of the DVD it became possible to distribute things like normal length movies via a more cost-effective medium.