What does chromium mean?
Chromium is a hard, glossy, steel-gray metallic element with the symbol Cr and atomic number 23. Prized chiefly for its resistance to corrosion, it is best known as the key ingredient in stainless steel, which must contain at least about ten percent chromium to resist rusting. It is also widely applied as a thin electroplated layer — familiarly called chrome — to give everyday objects such as faucets and car trim their mirror-like shine. Beyond industry, chromium exists in different chemical forms with very different effects on health: trivalent chromium is an essential trace nutrient involved in metabolizing carbohydrates and fats, while hexavalent chromium is toxic and carcinogenic. The element's name derives from the Greek word for color, reflecting the brilliantly colored compounds it forms, and it was first isolated in the late eighteenth century from the mineral crocoite.
A hard, lustrous, steel-gray metallic element (symbol Cr, atomic number 23), used in stainless steel and other alloys and for electroplating.
"Chromium is added to iron to produce corrosion-resistant stainless steel."
Trivalent chromium regarded as an essential trace mineral in human nutrition, involved in carbohydrate and lipid metabolism.
"Brewer's yeast is a natural source of dietary chromium."
As a mass noun denoting a substance, chromium has no plural form and takes singular verbs.
"The ore contains a small amount of chromium."
Chromium owes its name to the Greek word for color because its compounds come in a rainbow of vivid hues — from ruby red to brilliant yellow.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of chromium
Chromium's name comes from the Greek word chrōma, meaning "color," chosen because its compounds display strikingly varied colors. The French chemist Louis-Nicolas Vauquelin discovered the element in 1797–1798 while analyzing the mineral crocoite, naming it after its colorful salts. It shares this Greek root with related words such as "chrome," "chromatic," and "chromosome."
Related word forms
How chromium is actually used
Chromium is an uncountable mass noun in standard usage, so it takes singular verbs and has no ordinary plural. In chemistry it appears in technical compounds such as "chromium(III)" and "hexavalent chromium," where oxidation state matters; hexavalent chromium is notably toxic and carcinogenic, while trivalent chromium is the biologically relevant form.
Easily confused with chromium
"Chrome" refers to the shiny chromium-plated surface or finish itself, while "chromium" is the actual metallic element.