Home › Words › J › jiggermastjiggermastjiggermast means the fourth-tallest mast on a ship with more than three masts; particularly a full-rigged ship.EtymologyFrom jigger + mast.nounThe fourth-tallest mast on a ship with more than three masts; particularly a full-rigged ship.e.g.“It was Margaret who came to where I was stationed by the jiggermast and told me what had occurred; and it was she who took my rifle and relieved me so that I could go aft.” — 1914, Jack London, The Mutiny of the Elsinore, Chapter XLV:Definitions & examples from Wiktionary (CC BY-SA 3.0).