Logos Bible Software
One of the finest reading habits to cultivate is to look up words that you encounter along the way if you are unfamiliar with them.
Problem: In some circumstances following this ideal advice is unrealistic, especially if a dictionary is not conveniently at your disposal.
Solution: This is yet another reason that I prefer reading e-books with the Libronix Digital Library System, launched and owned by Logos Bible Software. (See my related post on Logos’ Scholar’s Library: Gold.) When I encounter an unfamiliar word, I simply right-click on it and instantly locate it in the Merriam-Webster’s Collegiate Dictionary.