Liddell-Scott-Jones

ὀβολός (obolos) a obolus ^G:N-M

ὀβολός, ὁ,

obol, used both as a weight and coin, at Athens, = 1/6 of a δραχμή, rather more than three halfpence, [Refs 5th c.BC+]; πολὺ or μικρὸν τοῦ ὀ. a thing of which you get much or little for an obol, i. e. worthless or valuable, [Refs 5th c.BC+]; ἐν τοῖν δυοῖν ὀβολοῖν θεωρεῖν 'to sit in the cheap seats', [Refs 4th c.BC+]

__II as a weight, [ὀβολός, ὀβελός, ὀβελλός, ὀδελός">Refs 2nd c.AD+] are different dialect forms of a word for 'spit' or 'nail', nails being used in early times as money, six of them making a handful (δραχμή),[Refs 1st c.AD+]