Online

• Logeion
  Quick look-up of Greek and Latin words across all of the Perseus texts.
• Thesaurus Linguae Latinae (TLL)
  Most comprehensive Latin dictionary whose detailed entries cover texts from antiquity to approximately 600 CE and include the etymology and later development of each word in the romance languages. However, it is not yet complete, comprising the letters A–M, O, P–pyxodes. See here for PDFdigitizations of the printed fascicles.
• English / Latin Dictionary (Perseus)
• English / Greek Dictionary (Perseus)
• Chiron
  Useful web extension that provides definitions and morphology to Latin and Greek words found in web pages. Provides links to Perseus andLogeion as well.
• Repertorio bibliográfico de la lexicografía griega: Suplemento (RBLG-Supl.)
  Bibliographic supplements of the print edition of RBLG, a bibliography that provides scholars with a way to explore the existing studies on any Greek word.[N.B. We should purchase a print version of RBLG for 30 euros]
• Classical Language Toolkit (CLTK)
  Offers natural language processing support for Classical languages. This applies computer-assisted methods for describing, interpreting and even generating human language. It is a tool that makes it possible to produce reproducible scientific research that advances the study of ancient language and literature.
• Greek Lexicography – Oxford Bibliographies in Classics. James, P. 2009.

In Print

• A Greek-English Lexicon. Liddell, Henry George, and Robert Scott. 9th ed. Revised by Henry Stuart Jones with Roderick McKenzie and others. Oxford, England: Clarendon Press, 1996.
  Classmark: REF PA 445.E5 LID
  The standard Greek dictionary.
• Oxford Latin Dictionary. Glare, P. G. W., ed. Oxford, England: Clarendon Press, 1982.
  Classmark: LRG PA 2365.E5 GLA V.2The standard Latin dictionary.
• A Greek-English Lexicon of the New Testament and Other Early Christian Literature. Bauer, Walter. 3rd ed. Rev. and ed. Frederick W. Danker. Chicago : University of Chicago Press, 2000. Classmark: PA 881 ARN
• A Patristic Greek Lexicon. Lampe, G. W. H., ed. Oxford, England: Clarendon Press, 1961.Classmark: PA 981 REF
• English-Greek Dictionary: A Vocabulary of the Attic Language. Woodhouse, S.C. 2d ed. with suppl. London: Routledge & Kegan Paul, 1954.
  Classmark: REF PA 445.E5 WOO
• A Glossary of Later Latin to 600 A.D. Souter, Alexander. Oxford, England: Clarendon Press, 1949.Classmark: PA 2371 SOU