nounmasculinea-stemboarProbably a substrate loan or European Wanderwort. Traditionally compared with Latin aper (‘wild boar’) from Proto-Italic *apros (‘wild boar’), Proto-Balto-Slavic *weprios (‘board, wild boar’), and Thracian ἐβρος (ebros, ‘buck’), and sometimes reconstructed as PIE *h₁ep-r-. However, the comparison involves persistent irregularities: Italic *a- beside Proto-Germanic *e-, and especially Balto-Slavic initial *w-, are not easily derived from a single inherited PIE preform. Šorgo (2020) therefore treats *eburaz as a likely substratum lexeme, with the Proto-Germanic *e- possibly reflecting a substrate vowel *æ-.