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rock maple
rock mechanics
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
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rocker arm
rock·er arm (plural rock·er arms)


noun 
Definition:
 
pivoted lever that transmits motion: a pivoted lever, e.g. in an internal-combustion engine, that transmits motion from a cam or push rod at one end to open and close a valve at the other
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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