In the book of Nietzsche called "On the Genealogy of Morals" there is this sentence:
Let us speak out this new demand: we need a critique of moral values, the value of these values is for the first time to be called into question—and for this purpose a knowledge is necessary of the conditions and circumstances out of which these values grew, and under which they experienced their evolution and their distortion (morality as a result, as a symptom, as a mask, as Tartuffism, as disease, as a misunderstanding; but also morality as a cause, as a remedy, as a stimulant, as a fetter, as a drug), especially as such a knowledge has neither existed up to the present time nor is even now generally desired.
So, does anyone know what "Tartuffism" mean? Search over the internet didn't give anything satisfactory. I didn't find corresponding noun or verb. I would be eager to find out what does it mean.