- the lowermost spar of a compound mast, stepped in the hull of a vessel and carrying a topmast and any other upper spars.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for lower mast
Unknown to us, this had happened to a strong, new manilla rope by which Murphy was being hauled to the top of the lower-mast.The Home of the Blizzard
A top-mast is raised at the head or top of the lower-mast through a cap, and supported by the trestle-trees.The Sailor's Word-Book
William Henry Smyth
This formed a rectangular staging, with the lower-mast running fore and aft through its centre.Under the Meteor Flag