Comparative form of 'bloomy'; more covered with bloom (a whitish powdery coating on fruit) or more flowery/healthy-looking.
From 'bloom' plus comparative '-ier.' The word reflects the dust coating on grapes and plums that protects them.
That whitish powder on fresh grapes is bloom—the bloomier the grape, the fresher it is, because that protective coating washes off with handling and time.
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