Containing, composed of, or resembling gypsum or chalk; having the characteristics of gypsum.
From Latin 'gypsum' (gypsum) plus English adjectival suffix '-ous,' directly describing the mineral composition or appearance of a substance.
Gypsum is so common in building materials that 'gypsous' rocks have literally shaped human architecture for thousands of years—ancient Egyptians used gypsum for their pyramids, and we still use it in drywall today!
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