Mo'in Encyclopedic Dictionary (Persian: فرهنگ فارسی معین, Farhang-e Mo'īn) is the second largest Persian encyclopedic dictionary.
It was collected and integrated by Professor Mohammad Mo'in.
The Moin Encyclopedic Dictionary was compiled during a 19-year period (1947-1966) under the administration of Mohammad Mo'in.
After his death in 1971, the dictionary had been completed by Ja'far Shahidi.
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