eṣinṣin noun /ē.ʃĩ̄.ʃĩ̄/ spelling unconfirmed
eeṣin (alternative), eṣiṣi (alternative), iṣiṣi (alternative)
Definitions
  1. housefly, fly (insect)
Etymology
Proposed to be derived from Proto-Yoruboid *V́-cĩcĩ, cognate with Igala áchichi, Olukumi esinsin, Ifè etsĩtsĩ, see Yoruboid reconstruction for more, likely also related to English tsetse, Tswana tsêtsê.
Source: Wiktionary, where this word is spelled “eṣinṣin”. Reference: en-eṣinṣin-yo-noun-boOaycX2