| gravity cell | |
| —n | |
| an electrolytic cell in which the electrodes lie in two different electrolytes, which are separated into two layers by the difference in their relative densities | |
| a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes. |
| a screen or mat covered with a dark material for shielding a camera lens from excess light or glare. |