A Hebrew and English Lexicon of the Old Testament, more commonly known  as Brown–Driver–Briggs or BDB (from the name of its three authors) is a standard reference for Biblical Hebrew and Biblical Aramaic, first published in 1906. It is organized by (Hebrew) alphabetical order of three letter roots.
A widely accepted dictionary of Old Testament Hebrew and Aramaic, commonly referred to as Brown–Driver–Briggs or BDB, was first released in 1906. This reference work is arranged alphabetically according to three-letter Hebrew roots.