English edit

Noun edit

PPD (countable and uncountable, plural PPDs)

  1. (psychiatry) Initialism of paranoid personality disorder.
    Coordinate terms: SzPD, StPD
  2. (psychiatry) Initialism of postpartum depression.
    Hypernym: PPMD
  3. (biochemistry) Initialism of purified protein derivative.
  4. (computing) Initialism of pixels per degree (a measurement of the visual fidelity of a virtual reality headset).
  5. (astronomy, countable) proplyd; Abbreviation of protoplanetary disc.
    Coordinate term: CPD

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