Ferrous a. : Pertaining to, or derived from, iron; -- especially used of compounds of iron in which the iron has its lower valence; as, ferrous sulphate.

Example:
What is the difference between Ferrous Fumarate and Ferrous Gluconate?

Taxonomy
Ferrous metals, free encyclopedia, pig iron, compound, oxidation state, chemical science, search, bivalent, trivalent, adjective, presence, ferrum, carbon content, alloys, stainless steel, free dictionary, non-ferrous, Personal tools.

Defination from the web:
Ferrous. From Wikipedia, the free encyclopedia. Jump to: navigation, search. Ferrous, in chemical science, indicates a bivalent iron compound (+2 oxidation state), as opposed to ferric, which indicates a trivalent iron ...