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Gastrointestinal Stromal Tumor (GIST) If you have a gastrointestinal stromal tumor or are close to someone who does, knowing what to expect can help you cope. Here you can find out all about gastrointestinal stromal tumors, including risk factors, symptoms, how they are found, and how they are treated.
Definition of zest. 1  1 : a piece of the peel of a citrus fruit (such as an orange or lemon) used as flavoring. 2  2 : an enjoyably exciting quality : piquancy adds zest to the performance. 3  3 : keen enjoyment : relish, gusto has a zest for living.