The edition that I will be referring to throughout is the Teubner edition. My copy was printed in 1993 in Germany. Project Gutenberg unfortunately does not seem to have a copy currently in the original, although it does have modern Greek translations. Nevertheless I found this version freely available from Perseus.
Although one can of course use a full sized lexicon (Liddell & Scott— found on-line here— being standard for English speakers) I will pass along the recommendation made to me by a professor of mine many years ago. Namely when reading Homer, using A Homeric Dictionary by Autenrieth (found conveniently on-line here) is quicker and easier.