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| a cyclone that forms on a front and, in maturing, produces an increasingly sharp, wavelike deformation of the front |
| the variable frontal zone of middle latitudes separating air masses of polar and tropical origin |
| Main Entry: | condensation nucleus |
| Part of Speech: | n |
| Definition: | any tiny suspended particle in the atmosphere, either liquid or solid, upon which condensation of water vapor begins |
| Example: | Most condensation nuclei are produced by natural and man-made fires over land and by wave action over the oceans. |
| Usage: | science |