Etymology

seronegative

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Today it means: Testing negative for a given pathogen, especially HIV. (of blood serum) Full definition →

English negative ← Latin serum ← Proto-Italic *serom
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The story

  1. Proto-Indo-European*ser-
  2. Proto-Indo-European*sér-o-
  3. Proto-Italic*serom
  4. Latinserum
  5. Englishserum
  6. Englishsero-
  7. Englishnegative
  8. English todayseronegative

From sero- + negative.

Etymology from Wiktionary, CC BY-SA 4.0.