say it: AL-kuh-lahy
alkali is a noun meaning "any of various water-soluble compounds capable of turning litmus blue and reacting with an acid to form a salt and water". It carries 2 recorded senses.
a mixture of soluble salts found in arid soils and some bodies of water; detrimental to agriculture
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for alkali come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.