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| a scrap or morsel of food left at a meal. |
| an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle. |
| oxygen mask | |
| —n | |
| a device, worn over the nose and mouth, to which oxygen is supplied from a cylinder or other source: used to aid breathing | |
oxygen mask n.
A masklike device that is placed over the mouth and nose and through which oxygen is supplied from an attached storage tank.