1) a thick jacket with a hood, worn to keep out rain, wind and cold (anorak)

2) a framework of wooden or metal bars placed across an opening such as a window, used to keep out burglars or to allow air to flow through (grating)

3) (often movable) upright framework (some made to fold), used to divide a room; anything that is or can be used to give shelter or protection form observation, thee weather etc; a surface on which films, photographs, TV pictures are shown; a frame with fine wire netting to keep out insects (screen)

4) a movable cover for a window, used to keep out light; the device that opens to admit light through the lens of a camera (shutter)