capecitabine /kæp.əˈsaɪ.tə.biːn/ noun1 •An antineoplastic drug C₁₅H₂₂FN₃O₆ (trademark Xeloda) that is converted in the body to fluorouracil and is administered orally to treat colorectal cancers and often in conjunction with docetaxel to treat metastatic breast cancer.