Obolus n. : A small silver coin of Athens, the sixth part of a drachma, about three cents in value.

Obolus n. : An ancient weight, the sixth part of a drachm.

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Taxonomy
obolus, free encyclopedia, coin, obol, Classical Athens, obolos, gram, chalkoi, wealth, silver coin, search, guard, copyright violations, factual inaccuracies, Attica, 449 BC, LUCANIA, Metapontion.

Defination from the web:
obolus (ancient Greek: ὀβολός "obolós", plural: ὀβολοί "oboloí") is a Greek silver coin worth a sixth of a drachma. ... The deceased were buried with an obolus, placed in the mouth of the corpse, in order that, once a dead person's shade reached the underworld of ...