Sails on a ship that are attached to a tall, thin pole that sticks out from the ship's mast.
Spritsails are important for making the ship go when the wind blows.
Examples:
The spritsails help the ship move when the wind blows.
The sailors raise the spritsails when they want to go faster.
The spritsails are attached to the pole on the ship.
The spritsails look like big sheets on sticks.
The spritsails catch the wind and make the ship go really fast.
The spritsails are like big flags on the ship.