ad·e·no·car·ci·no·ma \|adən(ˌ)ōˌkärsənˈōmə\noun (pluraladenocarcinomas \-məz\ ; alsoadenocarcinoma·ta \-məd.ə\) Etymology: New Latin, from aden- + carcinoma : a malignant tumor originating in glandular epithelium < adenocarcinoma of the breast > • ad·e·no·car·ci·nom·a·tous\-sən|äməd.əs, -ōm-\adjective