
Originally Posted by
pomp
Interesting. Both the words 'mathematics' and 'physics' derive from Greek-- μάθημα and φύσις respectively.
My guess (I don't actually know) is that the modern word for one who studies mathematics comes from the French--mathématicien-- and is therefore 'mathematician' and not mathematicist.
'Physicist', on the other hand, must derive from a different language, probably greek or latin, as the French word for 'physicist' is 'physicien', meaning that if the English word had, like mathematician, come from the French, it would be 'physician', which in English is a word with a totally different meaning! (physician in French is just médecin, which, as far as I'm aware, is the same word they use for doctor)
Maybe someone who knows a bit more can clarify.