HORNFELS

Pronunciation (US):

(GB):

 I. (noun) 

Sense 1

Meaning:

A fine-grained metamorphic rock formed by the action of heat on clay rocks

Synonyms:

hornfels; hornstone

Classified under:

Nouns denoting substances

Hypernyms ("hornfels" is a kind of...):

metamorphic rock (rock altered by pressure and heat)

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