ppd

1. abbreviationnot comparableAbbreviation of postpaid (“having the cost of postage already paid”).

   Stratigraphic and geological collections available. All shipments ppd. Full money back guarantee.

   1965, “Fossils”, in Rocks and Minerals, volume 40, number 12, →DOI, Classified Advertisements, page 942

   1 more example

   Hyper grind/jazz spacecore with clarinet & barking vocals. Comes w/lyrics, photos, and full colour cover!!! All for only $4.00 ppd. worldwide. Trades are welcome.

   1994, “Grind Spacecore” (advertisement), in Chaotic Noise, number 3, Roanoke, Va., [https://archive.org/details/chaotic_noise_3/page/n49/mode/2up?q=spacecore page [50]]

plural PPDs

1. abbreviationcountableinitialismuncountablehuman sciencesInitialism of paranoid personality disorder.
2. abbreviationcountableinitialismuncountablehuman sciencesInitialism of postpartum depression.
3. abbreviationcountableinitialismuncountablebiochemistryInitialism of purified protein derivative.
4. abbreviationcountableinitialismuncountablecomputingInitialism of pixels per degree (“a measurement of the visual fidelity of a virtual reality headset”).
5. abbreviationcountableastronomyproplyd; Abbreviation of protoplanetary disc.
6. abbreviationcountableinitialismuncountablechemistryInitialism of paraphenylenediamine.
7. abbreviationcountableinitialismuncountablemanagementInitialism of project product description.