Etymology

roseola infantum

Today it means: A childhood disease caused by human herpesvirus, and characterised by a high-grade fever and a rash which appears as the fever is seemingly resolving. Full definition →

Latin roseola īnfantum
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The story

  1. Latin · borrowed fromroseola īnfantum“a rosy (rash) of the infant”
  2. English todayroseola infantum

Borrowed from Latin roseola īnfantum (“a rosy (rash) of the infant”).

Etymology from Wiktionary, CC BY-SA 4.0.