a projecting, often padded support for the forearm, as at the side of a chair or sofa or between seats in a theater, car, or airplane.
Also called arm.

1885–90; arm1 + rest1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
armrest (ˈɑːmˌrɛst)
Sometimes shortened to: arm the part of a chair, sofa, etc, that supports the arm

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
Such contact is usually tolerable, unless dished out by one of the flying
  world's armrest hogs.
But between seats is a five inch armrest, enough space so you can sit back
  straight without shoulders touching your seatmate.
Couples can sit angled towards each other and use the large middle armrest as a
She locks the interface next to the fixed armrest, slightly lower, and then
  drops her arm from the armrest into the interface.
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