alkali.
One of a class of caustic bases, such as soda, soda ash, caustic soda, potash, ammonia, and lithia, whose distinguishing characteristics are dissolving 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.
Meaning & usage
One of a class of caustic bases, such as soda, soda ash, caustic soda, potash, ammonia, and lithia, whose distinguishing characteristics are dissolving 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.
Soluble mineral matter, other than common salt, contained in soils of natural waters.
Where this word comes from
Etymology tree Arabic اَلْقِلْي (al-qily)der. Medieval Latin alcalibor. French alcalibor. English alkali From French alcali, from Medieval Latin alcali, ultimately from Arabic اَلْقِلْي (al-qily, “alkali, ashes (in reference to ashes of the saltwort)”), related to قَلَى (qalā, “to roast in a pan, fry”).
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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.
Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.