zest
US /zest/
UK /zest/

1.
great enthusiasm and energy
:
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She approached life with a remarkable zest.
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His performance lacked zest and energy.
2.
the outer colored part of the peel of a citrus fruit, used as flavoring
:
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Add a teaspoon of lemon zest to the cake batter.
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Orange zest can enhance the flavor of many dishes.