Answer: It is “fa’asqaynākumūhu” (فَأَسْقَيْنَاكُمُوهُ) and means: so we gave it to you to drink.
Okay, to be more correct: This is not a word, it is actually the longest chain of letters.
Arabic is a Semitic language. It works very different compared to English or French. There is actually only little use in looking for the shortest or longest word because most words have a root consisting of three letters. You can add vowels, pre- and suffixes, and put the root into several patterns. Notice that in Arabic, the above-mentioned “word” is actually a whole sentence.
Anyway it is interesting to have a look at the word: فَأَسْقَيْنَاكُمُوهُ. It consists of 11 letters and is found in sura 15 The Rocky Tract – in Arabic: al-Hijr (سُورة الْحِجْر):
Let’s check the words:
We send the winds to fertilise, and We bring down water from the sky for you to drink – you do not control its sources.
وَأَرْسَلْنَا الرِّيَاحَ لَوَاقِحَ فَأَنزَلْنَا مِنَ السَّمَاءِ مَاءً فَأَسْقَيْنَاكُمُوهُ وَمَا أَنتُمْ لَهُ بِخَازِنِينَ.
so, thus (particle)
you (indirect object)
to give to drink (past tense); irrigate
it (direct object)
we gave to drink
Here are some more interesting facts:
How many words are there in the Qur’an?
Answer: Most scholars say 77,429 words. It is not clear how to count them. In the Qur’an, at the beginning of some suras, you will find strange combinations of letters which do not have a meaning; at least we don’t know them. They are called al-Muqatta‘āt (الْمُقَطَّعات).
Some more statistics – please note that some people count several aspects differently, but the order of magnitude is of course the same.
Number of suras: 114
Number of verses: 6,236
Number of dots in Qur’an: 1,015.030
Number of letters: 323,671
Most common word: from (مِن); it occurs 2,763 times
In the Qur’an are mentioned:
16 places, cities or countries
15 names of things that can be eaten or drunk
1 month – Ramadan (رَمَضان)
1 woman – Maryam (Mary)