Iodine is a chemical element with symbol I and atomic number 53. The heaviest of the stable halogens, it exists as a lustrous, purple-black metallic solid at a standard conditions that sublimes readily to form a violet gas. The elemental form was discovered by the French chemist Bernard Courtois in 1811.
Definition of CHOLLA. : any of numerous shrubby opuntias chiefly of the southwestern United States and Mexico that have needlelike spines partly enclosed in a papery sheath and cylindrical joints âcalled also cholla cactus.
The prickly pear cactus is also called the paddle cactus and belongs to the Opuntia genus of cacti. They are also a distinct cactus species, due to their dual spike system, fixed spines and prickly glochids. The leaves or pads of cactus are called nopales and the fruit is called tuna or pear.ut there are some species of cactus that are useful in the field of health and medicine. In this article, learn about the medicinal uses of cactus plants as well as nutritional benefits of the same. Cactus Plants That Aid in Health and Medicine. All cactus plants aren't edible.