a small auxiliary mast fastened just abaft the mainmast or foremast of a sailing vessel.
Talk Like A Sailor: 9 Fascinating Nautical TermsIn sailing, a moonraker is a light square sail set at the top of the mast. But this term is also a demonym for people from Wiltshire, England.
Origin of trysail mast
First recorded in 1760–70
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for trysail mast
But the wonder of wonders is the iron pivot of a trysail-mast that was driven clean through the chest of a Scarborough lad.Haunted London|Walter Thornbury