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chert
Definitions
[tʃəːt], (Noun)
Definitions:
- a hard, dark, opaque rock composed of silica (chalcedony) with an amorphous or microscopically fine-grained texture. It occurs as nodules (flint) or, less often, in massive beds
Phrases:
Origin
:
late 17th century (originally dialect): of unknown origin
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definition by Oxford Dictionaries