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1. The principal mast of a sailing vessel.
2. The taller mast, whether forward or aft, of a two-masted sailing vessel.
3. The second mast aft on a sailing ship with three or more masts.
4. The lower section of such a mast.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
(Nautical Terms) nautical the chief mast of a sailing vessel with two or more masts, being the foremast of a yawl, ketch, or dandy and the second mast from the bow of most others
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
main•mast(ˈmeɪnˌmæst, -ˌmɑst; Naut. -məst)
the second mast from forward in any ship having two or more masts, except for a yawl or ketch.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
Collins Spanish Dictionary - Complete and Unabridged 8th Edition 2005 © William Collins Sons & Co. Ltd. 1971, 1988 © HarperCollins Publishers 1992, 1993, 1996, 1997, 2000, 2003, 2005
mainmast[ˈmeɪnˌmɑːst] n → albero maestro
Collins Italian Dictionary 1st Edition © HarperCollins Publishers 1995