One who is versed in or professor of an ‘ology’; a scientist.(noun)
The Century Dictionary (Public Domain)
Use "ologist" in a sentence
"Seriously, I could tell you EVERY OTHER "ologist" but until June 7, 2005 I had no idea what an endocrinologist dealt with."
"Lifelong weather nerds like me probably pay more attention to this stuff than anyone whose title doesn't end in "- ologist," but the meteorological events of this past month have been hard for anyone to ignore."
"I find it so funny and soo sad that any 'ologist' puts his name on the nameing of any dinosaur find."