Ferrous is a term that refers to IRON and its compounds. IRON is a chemical element with the symbol Fe and atomic number 26. It is a metal that is found in nature and is one of the most abundant elements on Earth. IRON is also an important component of many proteins and enzymes. IRONY is a figure of speech in which words are used in a way that conveys a meaning opposite to their literal meaning. It is often used to create humor or emphasize a point.