foremast       
noun [ C ] uk/ˈfɔː.mɑːst/ us/ˈfɔːr.mæst/
 (船的)前桅
the mast (= a tall pole that supports a sail) that is nearest the front of a ship
  He was ordered up the 120ft foremast to set the sails. 他奉命爬上120英尺的前桅,放帆启航。 
 The ship was hit by a shell, bringing the foremast down.  船被炮弹击中,前桅倒塌。 
 - More examples
- A ship came into view, with a black flag black flying from her foremast.
- The crew prepared to lift the ship's 100ft foremast back into place.
- The deck guns began firing and blew off the foremast.