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Table of Contents -- hornstone POS
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WORDNET DICTIONARY
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OXFORD DICTIONARY

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hornstone

Noun

horn=stone

WORDNET DICTIONARY

hornstone(n = noun.substance) hornfels - a fine-grained metamorphic rock formed by the action of heat on clay rocks;

is a kind of metamorphic rock

hornstone, n.

A siliceous stone, a variety of quartz, closely resembling flint, but more brittle; -- called also chert. [1913 Webster]

hornstone, n. a brittle siliceous rock.