Mewn cemeg, halwyn ïonig o fetel alcalïaidd neu elfen metel daear alcalïaidd yw alcali. Mae rhai awduron hefyd yn diffinio alcali fel bas sy'n hydoddi mewn dŵr.
| Enghraifft o'r canlynol | sylwedd cemegol  |
|---|---|
| Math | acidity regulator, Bas |
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