A small, slow-growing, benign or malignant tumor, found usually in the gastrointestinal tract, that is composed of islands of rounded cells and secretes serotonin.
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Noun
1.
carcinoid - a small tumor (benign or malignant) arising from the mucosa of the gastrointestinal tract; usually associated with excessive secretion of serotonin
neoplasm, tumor, tumour - an abnormal new mass of tissue that serves no purpose
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