Etymology
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zest (n.)

1670s, from French zeste "piece of orange or lemon peel used as a flavoring," of unknown origin. Sense of "thing that adds flavor" is 1709; that of "keen enjoyment" first attested 1791.

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Definitions of zest
1
zest (n.)
vigorous and enthusiastic enjoyment;
Synonyms: gusto / relish / zestfulness
zest (n.)
a tart spicy quality;
Synonyms: nip / piquance / piquancy / piquantness / tang / tanginess
2
zest (v.)
add herbs or spices to;
Synonyms: spice / spice up
From wordnet.princeton.edu