Achaʹtes (3 syl.)
.A fidus Achatēs. A faithful companion, a bosom friend. Achates in Virgil’s Æneid is the chosen companion of the hero in adventures of all kinds.
· 
· 
Entry taken from Dictionary of Phrase and Fable, edited by the Rev. E. Cobham Brewer, LL.D. and revised in 1895.