asilus

Etymology
. De Vaan (2008) considers it a borrowing given the initial as- instead of a rhotacised ar- or a regularly degeminated ās- following a long vowel (< *āss-/āts-). However, the present form would in fact be a regular outcome of *ass-ī/ei-los under the "-rule", as also in,. Compare, likewise of obscure origin.

Noun

 * 1) gadfly, horsefly