Greek-English Lexicon!

Greek-English Lexicon is an Ancient Greek dictionary suitable for students of the Ancient Greek language. It is the 1924 Liddell & Scott edition, which is in the public domain and has entries for 116,505 words, including definitions, etymologies, and citations. Make sure you look at Lexiphanes, thats a more recent version of L&S on the iphone, it might be a better deal.