I'm looking for a word that means 'to do or see, etc. something until it no longer fazes you'.
For example, a doctor who is used to seeing blood will not flinch or faint at the sight of it. Usually that 'something' is unpleasant. Acclimatize doesn't quite hit the mark. If memory serves right, the word perhaps begins with an 'i'. Of course, I could be wrong.