topmast

noun

section of mast on sailing ship

L329435 on Wikidata ↗

Wiktionary

Pronunciation: /ˈtɒpmɑːst/ / /ˈtɒpməst/ / /ˈtɑpmæst/

noun

Etymology: From top + mast.

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