1 orrosta
u, f., mod. orosta or orusta, with a single r; in rhymes orrostur þorrinn, Sighvat, shewing that the assimilation had even then taken place: [this word is identical with A. S. eornest = duellum; O. H. G. ernust = pugna: whence Fngl. earnest. Germ. ernst, of which orrosta is an assimilated form, qs. ornosta, see Grimm’s Dict. s. v. ernst]:—a battle, Hm., Nj. 8, Fms. v. 71, vi. 69, in countless instances, for orrosta and bardagi (q. v.) are used indiscriminately.
2 orrosta
2. in local names, Orrostu-hólmr, -hváll, -tangi, Battle-hill, etc., Korm., Eg.
3 orrosta
COMPDS: orrostulaust, orrostuligr, orrostumaðr, orrostuslög, orrostustaðr.