| Meaning | Any of various water-soluble compounds capable of turning litmus blue and reacting with an acid to form a salt and water. |
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| Synonym | base |
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| Narrower | imidazole, iminazole, glyoxaline | An organic base C3H4N2 |
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| melamine, cyanuramide | A white crystalline organic base |
| purine | A colorless crystalline organic base containing nitrogen |
| purine | Any of several bases that are derivatives of purine |
| pyridine | A toxic colorless flammable liquid organic base with a disagreeable odor |
| pyrimidine | Any of several basic compounds derived from pyrimidine |
| Broader | compound, chemical compound | (chemistry) a substance formed by chemical union of two or more elements or ingredients in definite proportion by weight |
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| Spanish | alcali, álcali, base |
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| Catalan | àlcali, base |
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| Verbs | alkalize, alkalify | turn basic and less acidic |
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