None of them seemed right to me. I wasn't tempted by a single one this time, although I think all those definitions are good enough to deserve words. Just not retiarius. Retiarius needs a more companionable definition.

All that said, I liked one definition a great deal, with a single reservation. I wish the Fertile Crescent part had been left out. If it had, then I think it would have been a perfect definition for retiarius:

a yellow calcite that forms on metallic artifacts from the Fertile Crescent when exposed to acidic liquids

I can't remember its letter, but that's the definition I'll vote for. I'll come back and add the letter in a minute.


Edit: L I vote for "L."