'Hornstone' definitions:
Definition of '
hornstone
'
From:
WordNet
noun
A fine-grained metamorphic rock formed by the action of heat on clay rocks [syn:
hornfels
, hornstone]
Definition of '
Hornstone
'
From:
GCIDE
Hornstone \Horn"stone`\, n. (Min.) A siliceous stone, a variety of quartz, closely resembling flint, but more brittle; -- called also
chert
. [1913 Webster]
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