Alumina

Part of speech: noun

Pronunciation: /əˈl(j)uːmɪnə/

Definitions

1. A crystalline compound formed from aluminum and oxygen that is essential in producing aluminum metal, ceramics, and as a catalyst in chemical processes
2. This oxide of aluminum, notable for its stability and strength, is widely used in the production of ceramics, metal refining, and various industrial applications
3. A white or colorless compound of aluminum oxide commonly utilized in the manufacturing of aluminum, ceramics, and as a key component in catalysts for chemical reactions

Etymology: Alumina is the oxide of aluminum, and its name points back to an older mineral substance: Latin "alumen," meaning alum, the astringent salt used for dyeing and tanning since antiquity. Chemists took the first part of that Latin word and attached the Latin ending "-a" to form a new name for the compound, so the word is a modern coinage built from classical material rather than an ancient term. The surprise is that the chemical name came before the metal's. Alumina was known as a distinct substance well before anyone isolated aluminum itself, so the oxide was named for the alum it was associated with, and the element was later named by analogy with it. The word is therefore a coinage of the chemical laboratory rather than of everyday speech.