1. farnus — de Vaan
farnus 'ash-tree (?)' [f o] (Vitn) The meaning of this near-hapax cannot be ascertained. As Schrijver 1991 shows in detail, it is very difficult to connect farnus with fraxinus by means of a common preform or a common PIE root The word cannot be derived from PIE *bhrHg-*birch' by means of known phonetic rules and without a number of ad hoc assumptions, and the meaning is uncertain anyway. It is best to regard the … — [de Vaan, s.v. farnus, p. 217]