carcinoidnoun [ C ]
uk/ˈkɑː.sɪ.nɔɪd/us/ˈkɑːr.səˌnɔɪd/also carcinoid tumour specializeda type of small tumour that grows slowly and is most commonly found in the stomach or intestines. It can be benign (= harmless) or malignant (= likely to cause death if untreated)