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BGL — Babylon Dictionary
BGL is the dictionary and glossary format of the Babylon translation software: words with their definitions or translations in one file.
Babylon, a translation program popular in the 2000s, used BGL files for its dictionaries, and thousands of free glossaries were made for it, from bilingual word lists to medical, legal and technical terms. A BGL file is compressed and stores each headword with its definition, often with formatting.
Babylon is hardly used any more, and other programs rarely open BGL. Converting it to a tab-separated TXT or a CSV gives a word list that a spreadsheet, a flashcard app such as Anki or another dictionary program can import; EPUB makes the dictionary readable on an e-reader.