ὀνάριονonárion, on-ar'-ee-on; neuter of a presumed derivative of G3688; a little ass:—young ass.
Thayer's Greek Lexicon
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STRONGS G3678:
ὀνάριον, ὀναριου, τό (diminutive of ὄνος; cf. (Winer's Grammar, 24 and) γιναικαριον), a little ass: John 12:14. (Machon quoted in Athen. 13, p. 582 c.; (Epictetus diss. 2, 24, 18).)