noun.
An obstetrician specializing in the care of the mother and fetus at higher than normal risk for complications.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
noun.
an obstetrician specializing in perinatology
Word Usage
"I know that when I was pregnant with my twins a couple of years ago and we were discussing in utero testing, I seem to recall the perinatologist intimating that 24 weeks was kind of a threshold."