Etymology

nanukayami fever

Today it means: leptospirosis Full definition →

Japanese 七日熱
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The story

  1. Japanese · borrowed from七日熱“7-day fever”
  2. English todaynanukayami fever

Borrowed from Japanese 七日熱 (nanukayami, “7-day fever”), from 七日(なぬか) (nanuka) + 病(や)み (yami).

Etymology from Wiktionary, CC BY-SA 4.0.