alumina

Estimated CEFR level: C2 — Proficiency

Estimated from word frequency; not an official CEFR classification.

Definition

From the combining form of Latin alumen + -a.

Lastly, this liquid being partly evaporated, crystals of sulphate of iron were deposited, and the not evaporated liquid, which contained the sulphate of alumina, was thrown away. — The Mysterious Island, Jules Verne
Right in the midst of this half-sad, half-sentimental reverie, she heard a familiar voice behind her say earnestly: “And allophite is the new hydrous silicate of alumina and magnesia, much resembling pseudophite, which Websky found in Silesia.” “What is Mac talking about!” she thought, and, peeping behind a great azalea in full bloom, she saw her cousin in deep conversation with the professor, evidently having a capital time, for his face had lost its melancholy expression and was all alive with interest, while the elder man was listening as if his remarks were both intelligent and agreeable. — Rose in Bloom: A Sequel to "Eight Cousins", Louisa May Alcott

aluminum oxide, aluminium oxide

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