from The Century Dictionary.
- noun In Yucatan, a subterranean rounded structure, with a rounded roof and an opening in the middle of the roof, probably used as a water-reservoir.
Sorry, no etymologies found.
Under the lid, about 16 inches across, ("just wide enough for a human body," he says), was a tunnel leading into a " chultun" (chull-TOON), a storage chamber.
Stopping to investigate, Pastrana saw two men extracting a large bowl from a hole in the ground -- the pair had chanced upon a chultun, or storage pit, that had been re-used as an elite Protoclassic (A.D. 50-250) tomb.