Luz or Luez.

“‘How doth a man revive again in the world to come?ʹ asked Hadrian; and Joshua Ben Hananiʹah made answer. ‘From luz in the backbone.ʹ He then went on to demonstrate this to him: He took the bone luz, and put it into water, but the water had no action on it; he put it in the fire, but the fire consumed it not; he placed it in a mill, but could not grind it; and laid it on an anvil, but the hammer crushed it not.”—Lightfoot.