Word.ws English Dictionary

NPPD

NPPD is the initialism of nitrophenyl pentadienal.

Meaning of nitrophenyl pentadienal

Noun

nitrophenyl pentadienal (uncountable)

  1. The chemical compound (2E,4E)-5-(4-nitrophenyl)penta-2,4-dienal, historically used as a tagging agent in espionage.
    Synonyms:
    spy dust

Questions about NPPD

What is NPPD the initialism of?
NPPD is the initialism of nitrophenyl pentadienal.

Words near NPPD in the dictionary

  1. NPOESS
  2. NPOIU
  3. NPOs
  4. NPOV
  5. NPP
  6. NPPD
  7. NPPs
  8. NPPV
  9. NPPVs
  10. NPQH
  11. NPQHs

Source and license

Adapted from Wiktionary: NPPD (page history and authors); nitrophenyl pentadienal (page history and authors). Text available under the Creative Commons Attribution-ShareAlike 4.0 license. Word.ws reformatted the entry and added links. Wiktionary data of 2026-09-02.

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Cite this entry: “NPPD.” Word.ws, https://word.ws/nppd. Based on Wiktionary, CC BY-SA 4.0.