You can add links to all Greek words in the TLG by choosing from the left-hand list (once you have found a Greek text) "TLG Links" or "Perseus." Each word will then link to published lexica (LSJ and others) in the TLG or out on the Perseus website.
Database of Latin Dictionaries
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Several modern and medieval dictionaries of ancient, medieval, late, and ecclesiastical Latin that can be searched separately or together.