elf bolt

Noun

elf-bolt (plural elf-bolts)

1. A belemnite
   • A proof much ſtronger of the diſtance at which the firſt poſſeſſors of this iſland lived from the preſent time, is afforded by the ſtone heads of arrows which are very frequently picked up. The people call them Elf-bolts, and believe that the fairies ſhoot them at the cattle.1775, Samuel Johnson, A Journey to the Western Islands of Scotland, volume I, Dublin: A. Leathley et al., page 141
2. A magical bolt used by elves as a weapon.
   • [A] bow, in order that they may discharge little arrows at men, and tease them, as they otherwise do with small pebbles; for the dangerous Elf-bolt of the Scotch tradition hath doubtless its counterpart in one that is harmless.1828, T. Crofton Croker, Fairy Legends and Traditions of the South or Ireland, volume III, London: John Murray, page 130