
Astragalomancy, also known as astragyromancy, is a form of divination that uses dice specially marked with letters and numbers. Originally, as with dice games, the `dice` were quadruped knucklebones or other small bones. Marked astragali of sheep and goats are common at Mediterranean and Near Eastern archaeological sites, particularly at funeral.....
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divination using dice or knucklebones
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• (n.) Divination by means of small bones or dice.
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http://thinkexist.com/dictionary/meaning/astragalomancy/
As·trag'a·lo·man`cy noun [ Greek ... ankle bone, die +
-mancy .] Divination by means of small bones or dice.
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http://www.encyclo.co.uk/webster/A/136

Astragalomancy is divination using dice or knuckle bones. It seems to have developed around the 17th century.
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astragalomancy, astragyromancy Divination with dice, knuckle bones, stones, small pieces of wood, or ankle bones which were marked with letters, symbols, or dots. Using dice for divination is a form of astragalomancy.
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