WordReference Random House Learner's Dictionary of American English © 2025
on•col•o•gy /ɑŋˈkɑlədʒi/USA pronunciation
n. [uncountable]
on•col•o•gist, n. [countable]
WordReference Random House Unabridged Dictionary of American English © 2025- Medicinethe study of tumors, including cancers.
on•col•o•gist, n. [countable]
on•col•o•gy
(ong kol′ə jē),USA pronunciation n.
on•co•log•ic
(ong′kə loj′ik),USA pronunciation on′co•log′i•cal, adj.
on•col′o•gist, n.
- Medicinethe branch of medical science dealing with tumors, including the origin, development, diagnosis, and treatment of malignant neoplasms.
- Medicinethe study of cancer.
- 1855–60; onco- + -logy