Definition of ETHNOMEDICINE. : the comparative study of how different cultures view disease and how they treat or prevent it; also: the medical beliefs and practices of indigenous cultures.
Ten materials familiar to various prehistoric cultures are now known to be chemical elements: Carbon, copper, gold, iron, lead, mercury, silver, sulfur, tin, and zinc. Three additional materials now accepted as elements, arsenic, antimony, and bismuth, were recognized as distinct substances prior to 1500 AD.
An element is a substance made up of atoms with the same number of protons. Elements are the simplest substances known. They can be metals (e.g. iron, copper, sodium magnesium) or non-metals (e.g. carbon, hydrogen, oxygen, nitrogen). There are just over 100 of them.