Comparative form of 'buttery'; more buttery, containing more butter or having more buttery qualities.
From 'buttery' plus comparative suffix '-er,' following standard English adjective comparison patterns for one-syllable or light two-syllable words.
The taste perception of 'butteriness' is partly from fat content but also from volatile compounds—that's why clarified butter tastes less buttery despite being 100% pure butter fat!
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