What does alloy mean?
An alloy is a substance formed by combining a metal with one or more other metals, or occasionally with a nonmetal, to produce a material with improved properties such as greater strength, hardness, or resistance to corrosion. Familiar examples include bronze (copper and tin), brass (copper and zinc), and stainless steel (iron with chromium). Alloys are central to metallurgy and modern engineering because pure metals are often too soft or reactive for practical use. The word also functions as a verb meaning to blend metals in this way, and it carries a figurative sense: to 'alloy' something can mean to diminish its purity or value by mixing in an inferior element. Historically significant — the Bronze Age and Iron Age are defined by humanity's mastery of alloys — the term remains essential vocabulary in science, industry, and everyday descriptions of materials like jewellery and car parts.
A metal made by combining two or more metallic elements, or a metal and a nonmetal, especially to give greater strength or resistance to corrosion.
"Brass, an alloy of copper and zinc, has been used for instruments and fittings for centuries."
Also used for a base metal mixed with a precious metal, as in coinage.
To mix or blend (a metal) with another substance to form an alloy; figuratively, to debase or reduce the quality of something by admixture.
"The mint alloyed silver with copper to make the coins more durable."
Less common than the noun; found mainly in technical or literary contexts.
Standard plural form; used when referring to multiple distinct alloy materials.
"Modern aircraft are built from a range of lightweight aluminium alloys."
The word 'alloy' comes from Old French 'alei', from Latin 'alligare' — the same root that gives us 'ally': alloys are literally metals that have become allies.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of alloy
The word 'alloy' entered English in the late Middle Ages via Anglo-Norman and Old French 'alei', ultimately deriving from Latin 'alligare', meaning 'to bind to'. This same Latin root underlies English words such as 'allay' and 'ally', reflecting the idea of metals bound together. The spelling was influenced by association with words beginning in 'al-' from the Latin prefix 'ad-'.
Related word forms
How alloy is actually used
As a noun, 'alloy' is standard register across technical and everyday contexts. The verb form is less common and appears mostly in metallurgical or figurative writing. In British usage, 'alloy' can also colloquially refer to aluminium wheel rims on cars ('alloy wheels').
Easily confused with alloy
Allay means to calm or reduce fear and anxiety, while alloy refers to a mixture of metals or the act of blending them.