The Ancient Macedonian word ἑταῖροι
Word ἑταῖροι
IPA hetaîroς
Meaning the cavalry of the Macedonian kings
Notes/Remarks This is a plural form
See also Homeric Greek: ἑταῖρος ‘comrade, companion’
Attic Greek: ἑταῖρος ‘comrade, companion, pupil’

Comments

Athenaeus

μετὰ δὲ τούτους ἦσαν οἱ λεγόμενοι ἑταῖροι ἱππεῖς