achaemenid

< /ˌæk əˈmɛn ɪˌdiz/.

1. a member of the dynasty of kings in ancient Persia that ruled from c550 b.c. to 331 b.c.

noun plural Achaemenids, Achaemenidae (ˌækɪˈmɛnɪˌdiː) or Achaemenides (ˌækɪˈmɛnɪˌdiːz)

1. any member of a Persian dynasty of kings, including Cyrus the Great, that ruled from about 550 to 331 bc, when Darius III was overthrown by Alexander the Great