Since the roots of many Persian words are unclear, a researcher should study the vocalic evolution of these words to get to the root. The word Dahyu is one of these words. From Indo-European period to modern Persian, this word has had many different meanings. The writer of this article, studies the different meanings of this word. To reach to the earlier form of the word, the writer has studied the history of the word, from its Indo-European form to modern Persian. In the end, the writer has constructed the most probable root for this word.
Key Words: Dahyu, Dasyu, Avesta, Yasht, Old Persian.
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