Most grape-like in appearance, taste, or quality; having the strongest characteristics of grapes.
From 'grape' + superlative suffix '-iest'. This is the highest degree form of grape-related description, following standard English comparative/superlative patterns.
Sommeliers distinguish wines on a spectrum—a 'grapiest' wine means it tastes most like actual fresh grapes, which paradoxically often means it's younger and less sophisticated than aged wines.
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