Definitions

1. noun

A mineral, MgO, consisting of magnesium oxide, occurring as a secondary mineral in igneous and metamorphic rocks, or as a residue from the evaporation of magnesium-rich brine. It is a common component of some types of water, especially in hot springs and mineral springs.

“The hot spring water contained high levels of magnesia, making it unpalatable to drink.”

2. noun

A region of the earth’s crust where magnesium-rich rocks are abundant.

“The geologist studied the magnesia regions of the mountain range to understand the local geology.”

3. noun

A type of soil or sediment rich in magnesium compounds.

“The farmer applied magnesia to his soil to increase its fertility and promote healthy plant growth.”

4. chemistry

A compound containing magnesium oxide or magnesium hydroxide.

“Magnesia is a key component in the production of certain types of glass and ceramics.”

5. chemistry

A chemical compound used as a desiccant or in the production of other chemicals.

“Magnesia is used as a drying agent in various industrial applications.”