What does azotise mean?
Azotise is a technical verb meaning to combine a substance with nitrogen, or to treat a material — most commonly a metal such as iron or steel — so that its surface becomes enriched with nitrogen compounds. In metallurgy, parts are azotised by heating them in ammonia or another nitrogen-bearing atmosphere, producing hard nitrides that improve resistance to wear and corrosion. The word derives from 'azote', the old French name for nitrogen, which itself comes from Greek roots meaning 'lifeless', reflecting nitrogen's inertness. Largely confined to nineteenth- and early twentieth-century chemical and engineering texts, azotise survives mainly in British spelling alongside the American variant azotize. It is a precise, formal term useful when discussing early nitriding processes, though modern metallurgy tends to prefer terms like nitride or case-harden.
verbTo combine or impregnate a substance with nitrogen; in chemistry, to convert an element or compound into a nitride or nitrogen-rich compound.
- To combine or impregnate a substance with nitrogen, especially converting metal surfaces into nitrides by heating in nitrogen or ammonia.
"The metallurgists heated the steel in ammonia to azotise its surface and harden it."
"Early metallurgists found they could azotise wrought iron at red heat, yielding a harder, more wear-resistant material."
"The patent described a process to azotise steel components using ammonia gas at high temperature."
Nitrogen got its old French name 'azote' from the Greek for 'lifeless' — so to azotise something is, etymologically, to make it lifeless.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of azotise
Azotise comes from 'azote', the name given to nitrogen in late eighteenth-century France, formed from Greek a- ('without') and zōē ('life'), because nitrogen was known not to support life. The verb was formed with the suffix '-ise' to denote treating a substance with this element. It entered English scientific usage in the nineteenth century, primarily in metallurgical contexts describing the conversion of iron surfaces into nitrides. Its American counterpart, azotize, follows the standard -ize spelling convention.
Related word forms
How azotise is actually used
A technical, largely historical term from chemistry and metallurgy; rare outside specialist literature. The British spelling 'azotise' coexists with the American 'azotize'.
Easily confused with azotise
Azotize is simply the American spelling of the same word, while azotise is the British spelling — they share one meaning, not two.
Azote is an obsolete French name for nitrogen itself (from Greek 'lifeless'), whereas azotise is the verb meaning to treat something with that element.