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rock moss
rock music
rock’n’roll
rock oil
rock pigeon
rock plant
rock rabbit
rock-ribbed
rock salt
rock snake
rock-solid
rock steady
rock-steady
rock wallaby
rock wool
rock wren
rockabilly
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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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