A platform near the head of each of the lower masts of a ship. In early fighting ships, a platform at the head of the mast, fenced with a rail (cf…

A platform at the head of a lower mast; a ‘top’.

Nautical. (See quot.) Obsolete.

Nautical. A platform, typically circular, around a masthead of a sailing ship.

Nautical. A barrel or cylindrical box fixed to the mast-head of an arctic, whaling or other ship, as a shelter for the look-out man.

a shelter at the mast-head for the look-out man, sometimes made with a cask, a ‘crow's nest’; also, a kind of round-house built on the deck.

A shelter or platform fixed near the top of a ship's mast to be used as a lookout; a crow's nest.