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1. (n.) alkali
any of various bases, the hydroxides of the alkali metals and of ammonium, that neutralize acids to form salts and turn red litmus paper blue.
2. alkali
any of various other active bases, as calcium hydroxide.
3. alkali
a soluble mineral salt or a mixture of soluble salts, present in some soils, esp. in arid regions, and detrimental to the growing of most crops.
4. (adj.) alkali
alkaline .
Etymology: (1300–50; < MF alcali < dial. Ar al-qalī, saltwort ashes)
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| Definition of 'alkali' |
Princeton's WordNet |
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1. (noun) base, alkali
any of various water-soluble compounds capable of turning litmus blue and reacting with an acid to form a salt and water
"bases include oxides and hydroxides of metals and ammonia"
2. (noun) alkali
a mixture of soluble salts found in arid soils and some bodies of water; detrimental to agriculture
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| Definition of 'alkali' |
Webster Dictionary |
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1. (noun) alkali
soda ash; caustic soda, caustic potash, etc
2. (noun) alkali
one of a class of caustic bases, such as soda, potash, ammonia, and lithia, whose distinguishing peculiarities are solubility in alcohol and water, uniting with oils and fats to form soap, neutralizing and forming salts with acids, turning to brown several vegetable yellows, and changing reddened litmus to blue
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Sense: a substance, the opposite of acid, such as soda.
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 Afrikaans: alkali |
 Arabic: فِلِز قَلَوي |
 Bulgarian: основа |
 Brazilian: álcali |
 Czech: zásada (chemikálie) |
 German: das Lauge |
 Danish: alkali; base |
 Greek: αλκάλιο |
 Spanish: álcali |
 Estonian: leelis |
 Farsi: فلز قلیایی |
 Finnish: emäs |
 French: alcali |
 Hebrew: בָּסִיס |
 Hindi: क्षार |
 Croatian: lužina |
 Hungarian: lúg |
 Indonesian: alkali |
 Icelandic: basi |
 Italian: alcali |
 Japanese: アルカリ |
 Korean: 알칼리 |
 Lithuanian: šarmas |
 Latvian: sārms |
 Malay: alkali |
 Dutch: alkali |
 Norwegian: base |
 Polish: zasada |
 Persian: فلز قلیایی |
 Pashto: قلوی |
 Portuguese: álcali |
 Romanian: substanţă alcalină |
 Russian: щёлочь |
 Slovak: zásada |
 Slovenian: lužnina |
 Serbian: alkalija |
 Swedish: alkali |
 Thai: ด่าง |
 Turkish: alkali |
 Taiwanese: 鹼 |
 Ukrainian: луг |
 Urdu: الکلی ، تیزاب سے برعکس |
 Vietnamese: chất kiềm |
 Chinese: 碱 |
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Definitions of alkali 
