
1) Sixth of a drachma, once 2) Weight 3) Weight unit
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https://www.crosswordclues.com/clue/obolus

• (n.) An ancient weight, the sixth part of a drachm. • (n.) A small silver coin of Athens, the sixth part of a drachma, about three cents in value.
Found on
http://thinkexist.com/dictionary/meaning/obolus/

genus of extinct brachiopod, or lamp shell, of the Cambrian Period (from 540 to 505 million years ago). Obolus was a small animal with a spherical ...
Found on
http://www.britannica.com/eb/a-z/o/3

Small Greek bronze coin. It is synonymous with small donation in money, charity
Found on
http://www.encyclo.co.uk/local/22059
Ob'o·lus noun ;
plural Oboli . [ Latin , fr Greek ]
(Gr.Antiq.) (a) A small silver coin of Athens, the sixth part of a drachma, about three cents in value.
(b) An ancient weight, the sixth part of a drachm.
Found on
http://www.encyclo.co.uk/webster/O/4

The obolus was an ancient Greek coin made of an alloy of silver and copper, and equal in value to one sixth of a drachma.
Found on
http://www.probertencyclopaedia.com/browse/JO.HTM

[
n] - a Greek unit of weight equal to one tenth of a gram
Found on
http://www.webdictionary.co.uk/definition.php?query=obolus
noun a Greek unit of weight equal to one tenth of a gram
Found on
https://www.encyclo.co.uk/local/20974

From obelos, which means roasting skewer. Ancient Greek coin worth one sixth of a drachma. Ovulus, the term for the medieval Scherf (half a pfennig, or mite) is derived from this. Today people still say: 'Jemand soll seinen Obolus leisten' (i.e. to pay one´s mite).
Found on
https://www.encyclo.co.uk/local/20978
No exact match found.