Topmast

n.

1.

(Naut.) The second mast, or that which is next above the lower mast, and below the topgallant mast.

Noun

1.

topmast - the mast next above a lower mast and topmost in a fore-and-aft rig

fore-topmast, main-topmast, mast, royal mast, topgallant, topgallant mast