æstri (sup. adj.) ‘highest’: Jón Helgason (ÍM II, 130n) suggested that this could be a development from hæstri (sup. adj. f. of hár ‘high’), if the poem was old enough to allow the rhyme zt : st; æztri could also be f. acc. sg. sup. of æðri ‘higher’ (œðri comp.; the adj. has no positive degree).