www.tolueislam.com/Parwez/expo/expo_glossary.htm (Arabic-English)
Lughaat Al Qur'an - by G.A. Parwez (English translation: Word document or PDF document)
www.emuslim.com/quran/lughat.asp (English, Urdu, Bengali)
Classical Arabic lexicons/dictionaries (Arabic only)
www.muhaddith.org/lexicons.html (Arabic & English)
Lisan al-Arab, Taj al-Arus, Qamus al-muhit
Lisan al Arab, al Qaamuus al Muheet, Maqaayees Allugha, al Sahaah fil lugha and al AAbaab al Zaakhir
al-Mufradat
fi
Gharib al-Quran by al-Raghib al-Asfahani (.rar file)
or www.aboutquran.com/res/lex/rIsfahani/MufradatRaghib.pdf
(.pdf file)
A list of many lexicons available online:
www.aboutquran.com/res/lex/Lexicon.htm
The
earliest
Classical Arabic Dictionary: Kitab al Ayn
Hans
Wehr (Modern Standard Arabic dictionary)
Dictionary
of
Holy Quran by Abdul Manan Omar (compilation of several, with grammar
information)
islamusa.org/dictionary.pdf
Arabic-English
Dictionary of Quranic usage (pdf)
E.W.
Lane's Arabic-English lexicon FREE online and on disc
E.W Lane's Lexicon - viewable online
E.W. Lane's Arabic-English lexicon (small files, for slow connections only)