As a Classicist, one of the questions I am asked more often is “what does this Ancient Greek word mean?”, since there is a lot of Greek vocabulary being actively used in literature, philosophy and what not.
I tend to direct people to the Perseus Word Study Tool. It isn’t the most attractive site I’ve ever seen but, once one has mastered how to enter the transliterated words on the keyboard they provide, I find it very useful for those occasional doubts about the several possible meanings of a word we might come across in a non-Greek context. The results can be abbreviated, or open in the dictionary entry of the Greek-English dictionary.
Here it is: http://www.perseus.tufts.edu/hopper/morph
(The rest of the site is also very useful, as it provides both the original and the English versions of a vast collection of Latin and Greek authors, but I guess that only matters if you are suspicious of a passage quoted in translation elsewhere.)
