Learn how to say Achaemenians correctly in English with this tutorial pronunciation video.
Oxford dictionary definition of the word Achaemenid:
relating to the dynasty ruling in Persia from Cyrus I to Darius III (553–330 bc).
a member of the Achaemenid dynasty.
from Greek Akhaimenēs ‘Achaemenes’ (the reputed ancestor of the dynasty) + -id3