- a sail rigged over a hatchway, ventilator, or the like, to divert moving air downward into the vessel.
Origin of wind sail
First recorded in 1715–25
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for windsail
The windsail hangs limp and breathless, and the thermometer stands at 120° Fah.
There was no suggestion of oppressiveness in the air and a windsail was not necessary to keep the cabin fresh and cool.In the Track of the Trades
Lewis R. Freeman
If clear decks are wanted, the windsail is about as inconvenient as it is ugly, and that is saying a great deal.
The flaps of the windsail hang dead, the sides of the canvas tube have fallen in like the neck of a skinny old man.
Away southward lies a black streak on the sky-line and the windsail flickers a little.
- a sail rigged as an air scoop over a hatch or companionway to catch breezes and divert them below
- any of the vanes or sails of a windmill
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012