yínrùnyínrùn noun /jĩ́.ɾũ̀.jĩ́.ɾũ̀/
yírùnyírùn (alternative), àrùn yínrùnyínrùn (alternative)
Definitions
  1. meningitis
Etymology
From reduplication of yín ọrùn (“twist neck”).
Component words
yín ọrùntwist neck
Source: Wiktionary, where this word is spelled “yinrunyinrun”. Reference: en-yinrunyinrun-yo-noun-0XMZ-ItX