<ahem> Those Latin speakers sure have a way with words. :-/
Pinging.
yea "placenta compressa" sounds like a women problem you see the doctor for
Blame the doctors. "Placenta" is Latin for "flat cake." Similarly, doctors noted the resemblance between the socket part of the hip joint and a vinegar bowl, and called it the "acetabulum"--but people don't talk about that as much as they do placentas, so you wouldn't say "eew, gross" if the article were to mention an acetabulum. :)
(And thank you, Mr. Townshend, wherever you are, for prodding us sixth-graders to learn words by letting us compete for chocolate milk. "Acetabulum" is forever engraved in my memory because of it.)