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| 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. |
| germ theory | |
| —n | |
| 1. | the theory that all infectious diseases are caused by microorganisms |
| 2. | the theory that living organisms develop from other living organisms by the growth and differentiation of germ cells |
germ theory n.
The doctrine holding that infectious diseases are caused by the activity of microorganisms within the body.