- zeoliteAny of several minerals, aluminosilicates of sodium, potassium, calcium or magnesium, that have a porous structure (originally, those which swelled and gave off water when heated); they are used in water softeners, in ion exchange chromatography, and as industrial catalysts.
- zeonthe hot water added to the chalice by the priest during the Byzantine Eucharist to commemorate the water that flowed from the crucified Christ's side when pierced by the spear