Boom 02 : (1) A heavy spar, usually attached to a mast, used for lifting cargo and equipment. (2) A long spar extending the length of a sail on a sailboat
Association of Marine Underwriters of San Francisco (AMUSF), Glossary of Marine Insurance and Shipping Terms, http://www.amusf.com/Definitions_A.htm, CA, USA 2011. (Mrtm Insur and Shipping - Amer) {575}