Definition of "magnesian" [mag•ne•sian]

• Containing magnesia (adjective)
• Describing minerals containing magnesium (adjective)

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• "Certainly it contains many shells of species now living in the neighbouring ocean; and the limestone ridge running parallel with and close to the coast, and which in the colony is falsely called magnesian limestone, contains a great proportion of modern shells."
• "This is a different type of limestone to the magnesian limestone used to construct the Roman walls, and the masonry technique is also different."
• "A different type of limestone, magnesian limestone, was used extensively in the Roman military fortress."