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There are 9 nine-letter words beginning with ALUM

ALUMINATE• aluminate n. (Chemistry) A compound, containing aluminium and oxygen with more electropositive elements, that is…
• ALUMINATE n. a salt whose acid is aluminum hydroxide.
ALUMINIDE• aluminide n. (Chemistry) Any intermetallic compound of aluminium and a more electropositive element.
• ALUMINIDE n. a compound that has aluminium with more electropositive elements.
ALUMINISE• aluminise v. (Transitive) To coat with a layer of aluminium.
• ALUMINISE v. to treat metal so as to form an aluminum coating on its surface, also ALUMINIZE.
ALUMINIUM• aluminium n. A light, silvery metal extracted from bauxite, and a chemical element (symbol Al) with an atomic number of 13.
• aluminium n. (Countable) A single atom of this element.
• aluminium n. (Slang) Aircraft or other machinery made partially or wholly of aluminium.
ALUMINIZE• aluminize v. US, Canada, and Oxford standard spelling of aluminise.
• ALUMINIZE v. to treat metal so as to form an aluminum coating on its surface, also ALUMINISE.
ALUMINOUS• aluminous adj. (Chemistry) of or pertaining to alumina or alum.
• ALUMINOUS adj. pertaining to or containing alum, or alumina.
ALUMINUMS• aluminums n. Plural of aluminum.
• ALUMINUM n. a light silvery malleable and ductile metallic element, also ALUMINIUM, ALUMIUM.
ALUMROOTS• alumroots n. Plural of alumroot.
• ALUMROOT n. a North American flower of the saxifrage genus.
ALUMSTONE• alumstone n. (Mineralogy) alunite.
• alum␣stone n. (Mineralogy) A subsulphate of alumina and potash; alunite.
• ALUMSTONE n. a hydrous sulphate of aluminum and potassium, aka alunite.

Scrabble words — in black are valid world wide — in RED are not valid in North America — in GREEN are valid only in North America.
Definitions are short excerpt from the WikWik.org and 1Word.ws.

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