topmast

(täp′mast′; naut., -məst)

noun

the second mast above the deck of a sailing ship, supported by the lower mast and often supporting a topgallant mast in turn

See topmast in American Heritage Dictionary 4

noun

The mast below the topgallant mast in a square-rigged ship and highest in a fore-and-aft-rigged ship.

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