[OIr. lúin, lance].
One of the most famous spears of early Irish literature, belonging most often to Celtchar. To quench its thirst for blood, Lúin had to be dipped in a cauldron containing ‘black fluid’ or ‘poison’ from time to time; otherwise its shaft would burst into flame. Mac Cécht uses it to kill Cúscraid. Dubthach Dóeltenga borrows it for Cath Maige Tuired [The (Second) Battle of Mag Tuired] but loses it soon after.