alumina

noun

alu·​mi·​na ə-ˈlü-mə-nə 

: the oxide of aluminum Al₂O₃ that occurs both in pure form as corundum and in hydrated forms (as in bauxite)

Examples of alumina in a Sentence

Recent Examples on the Web

Scientists think that the quantity of alumina from incinerated satellites is already approaching the same levels that result from the atmospheric demise of natural space rocks such as asteroids or meteoroids, which contain only trace amounts of aluminum. —Tereza Pultarova, Space.com, 2 Feb. 2025

The plant will produce about 100,000 tons of the three materials combined and will be the first U.S. facility to make alumina from common rocks. —Katie Fehrenbacher, Axios, 8 Jan. 2025

The integrated alumina plant, equipped with its own power plant and jetty, is designed to produce up to 1.2 million tonnes of alumina during its initial phase. —Yessar Rosendar, Forbes, 19 Sep. 2024

The top layer of the disk is a four-micrometer circle of 40-nanometer gold membrane resting on a small piece of alumina on layer of silicon deposited on silica. —IEEE Spectrum, 14 Nov. 2019

Word History

Etymology

New Latin, from Latin alumin-, alumen alum

First Known Use

circa 1790, in the meaning defined above

Rhymes for alumina

• lumina

Kids Definition

alumina

noun

alu·​mi·​na ə-ˈlü-mə-nə 

: the oxide of aluminum that occurs in nature as corundum and in bauxite and is used as a source of aluminum, as an abrasive, and as an absorbent

Medical Definition

alumina

noun

alu·​mi·​na ə-ˈlü-mə-nə 

: an oxide of aluminum Al₂O₃ that occurs native as corundum and in hydrated forms (as in bauxite) and is used in antacids

called also aluminum oxide