vertical pole used as the main support of a sailing vessel's rigging
A mast is the tall vertical pole that stands on a sailing ship and holds up all the ropes and sails that catch the wind. It matters because without a mast, a sailing vessel wouldn't be able to support its rigging and therefore couldn't sail.
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Three-masted training ship Mersey (c. 1908-1915)
The mast of a sailing vessel is a tall spar, or arrangement of spars, erected vertically or near-vertically on the median line of a ship or boat. A mast may carry sails, spars, and derricks. It may also give necessary height to a navigation light, look-out position, signal yard, control position, radio aerial, or signal lamp. Large ships have several masts, with the size and configuration depending on the style of ship. Nearly all sailing masts are guyed.
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