A person who studies, works with, or specializes in gypsum or gypsum-related geology and materials.
From 'gypsum' plus English agent suffix '-ster,' creating a nonce word or informal term for someone professionally involved with gypsum extraction, research, or application.
This playful word captures the spirit of specialized knowledge workers—a 'gypster' would understand drywall chemistry better than almost anyone, yet the term rarely appears in professional literature!
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