Linguistics
This noun is of the umu / imi class, consequently the singular (tree) is rendered Umuthi and plural (trees) is Imithi. Since the pronunciation of the initial vowel of this umu / imi class of Zulu noun, is unstressed, the singular Umuthi is sometimes heard as 'Muthi'. The word is rendered as muti due to the historical effects of British Colonial spelling.
Read more about this topic: Muti