This Proto-Nubian entry contains reconstructed terms and roots. As such, the term(s) in this entry are not directly attested, but are hypothesized to have existed based on comparative evidence.
Claude Rilly, Alex de Voogt, The Meroitic Language and Writing System (2012, →ISBN, with "intervocalic *-s- only preserved in Birgid; the resulting form *ui has been resyllabified into *iwi in the East"