mainmast

(mānmast′; naut., -məst)

noun

the principal mast of a vessel: in a schooner, brig, bark, etc., the mast second from the bow; in a ketch or yawl, the larger mast nearer the bow

See mainmast in American Heritage Dictionary 4

noun
  1. The principal mast of a sailing vessel.
  2. The taller mast, whether forward or aft, of a two-masted sailing vessel.
  3. The second mast aft of a sailing ship with three or more masts.

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