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From The Collaborative International Dictionary of English v.0.48:
Zest \Zest\, v. t. [imp. & p. p. Zested; p. pr. & vb. n. Zesting.] 1. To cut into thin slips, as the peel of an orange, lemon, etc.; to squeeze, as peel, over the surface of anything. [1913 Webster] 2. To give a relish or flavor to; to heighten the taste or relish of; as, to zest wine. --Gibber. [1913 Webster]