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Rock Cornish
rock crab
rock crystal
rock dove
rock elm
rock face
rock flour
rock garden
rock-hard
Rock Hill
rock hound
rock hyrax
Rock Island
rock lobster
rock maple
rock mechanics
rock moss
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rock-hard
rock-hard


adjective 
Definition:
 
very hard: extremely hard
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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