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agate

ag·ate [ ággət ] (plural ag·ates)


noun 
Definition:
 
1. type of chalcedony: a hard fine-grained semiprecious stone with variously colored bands, markings, and areas of clouding that is a form of chalcedony. Use: gems.

2. toy marble: a playing marble made of agate or of glass that looks like agate

[Late 16th century. Via French< Greek akhātēs, perhaps after Achates, river in Sicily]
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