From Longman Dictionary of Contemporary Englishoncologyon‧col‧o‧gy /ɒŋˈkɒlədʒi $ ɑːŋˈkɑː-/ noun [uncountable] the part of medical science that deals with cancer and tumours —oncologist noun [countable]
Examples from the Corpus
oncology• She was paid far less than she had earned in oncology, but enjoyed it far more.• Or you can do radiation oncology.• For instance, members can now receive radiation oncology, eye surgery, and emergency cardiac care from Summit Medical Center.• Search for alleviation and cure is a very basic human reaction, as shrines from Lourdes to high-tech oncology clinics testify.Origin oncology (1800-1900) Greek onkos “mass” 