oówo noun /ōó.wō/
oío (alternative), oghígho (alternative)
Definitions
  1. alternative form of eéwo (“boil”) alt-ofalternative
Etymology
Contraction of owíwo. The existence of o- and e- prefixes is a remnant of an ancient Volta-Congo noun-class system. See Ede Nago oówó, proposed to be derived from Proto-Yoruba *e-ɣíɣo, *o-ɣíɣo, ultimately from Proto-Edekiri *e-ɣíɣo, *o-ɣíɣo.
Source: Wiktionary, where this word is spelled “oowo”. Reference: en-oowo-yo-noun-ELAtET61