hnöllungrnafnorðkarlkynm. [hnallr], a large round stone, a large pebble, boulder. hnöllungs-grjót, n. pl. round pebbles.Skammstafanir og tilvitnanirm.karlkyn (e. masculine)n.hvorugkyn (e. neuter)pl.fleirtala (e. plural)