"Aesthete"

noun: UK/ˈiːsθiːt/ US​/ˈes.θiːt/​

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noun: aesthete; plural noun: aesthetes; noun: esthete; plural noun: esthetes

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a person who is appreciative of and sensitive to art and beauty.

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"The aesthete stood before the twenty-foot library shelves and forgot what his life was all about."