scleroderma bovista: an earthball with a peridium that is firm dry and smooth when young but developing cracks when mature; pale orange-yellow when young and reddish brown at maturity
earthball: any of various fungi of the genus Scleroderma having hard-skinned subterranean fruiting bodies resembling truffles
atomic number: the order of an element in Mendeleyev's table of the elements; equal to the number of protons in the nucleus or electrons in the neutral state of an atom of an element