Longboat

Long′boatˊ

,

Noun.

(Naut.)

Formerly, the largest boat carried by a merchant vessel, corresponding to the launch of a naval vessel.

,

Noun.

The largest and strongest boat belonging to a ship.

longboat ‎(plural longboats)

(nautical) Among the boats carried by a ship the largest, thus the most capable of boats carried on a ship.

ship's boat