pavesade

from The Century Dictionary.

• noun Any extended or continuous defense of a temporary nature, as a screen, parapet, or the like, used in warfare.
• noun A canvas screen extended along the side of a vessel when going into action, to prevent the enemy from observing operations on board.

from the GNU version of the Collaborative International Dictionary of English.

• noun A canvas screen, formerly sometimes extended along the side of a vessel in a naval engagement, to conceal from the enemy the operations on board.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun A canvas screen, formerly sometimes extended along the side of a vessel in a naval engagement, to conceal from the enemy the operations on board.