Nautical. a platform or shelter for a lookout at or near the top of a mast.
any similar platform raised high above the ground, as a lookout or a station for a traffic officer.
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British Dictionary definitions for crow's-nest
a lookout platform high up on a ship's mast
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012