Quote Originally Posted by Pierre View Post
How is it spelled in Arabic? I'd like to add it to Wiktionary, if it's not there already.
From the hennatribe thread linked above:

qāl rasūl allah, salla allah alayhu wa salam: Inna ahsunu ma ghaiyar bihi ash-schaib al-henna wa al-katam!
I reckon it is katam?