A person who studies or specializes in oology(noun)
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Use "oologist" in a sentence
"For the oologist, the rarer the bird, the more desirable was its clutch of eggs."
"Besides, the thought of Miss Francis for the work had been sheer sentimentality, the sort of false reasoning which would make of every mother an obstetrician or every hen an oologist."
"This composition hardens like pucca masonry in a very short time, and secures the nest from all marauders except the oologist."