Zest (noun)

The outermost and colorful part of the rind of a citrus fruit that is used as a flavoring.

Origin:

Middle english, from old french zest, from latin zestus, from greek zestos, from zestos, live, lively, from zein to boil, seethe.

Examples:

1. He grated the lemon zest to add flavor to the cake.
2. She added a little orange zest to the marmalade.
3. The zest of the lime gives the drink a tangy taste.
4. The zest of the orange is added to the dough for a citrus flavor.
5. She used zest of lemon in her recipe to add flavor.