on‧col‧o‧gy /ɒŋˈkɒlədʒi $ ɑːŋˈkɑː-/
noun [uncountable][
Date: 1800-1900;
Language: Greek;
Origin: onkos 'mass']
the part of medical science that deals with
cancer and
tumours—oncologist noun [countable] [TahlilGaran] Dictionary of Contemporary English ▲