-OLOGIST Meaning of -OLOGIST in English -ologist /ɒlədʒəst, ɒlədʒɪst $ ɑːl-/ AmE ( also -logist ) suffix [in nouns] a person who studies or has knowledge of a particular kind of science:a biologist Longman Dictionary of Contemporary English. Longman - Словарь современного английского языка. 2012