| lightning | | |
| n. (phenomenon) | 1. lightning | abrupt electric discharge from cloud to cloud or from cloud to earth accompanied by the emission of light. |
| ~ chain lightning, forked lightning | a form of lightning that moves rapidly in a zigzag path with one end divided (fork-like). |
| ~ atmospheric electricity | electrical discharges in the atmosphere. |
| ~ bolt, bolt of lightning, thunderbolt | a discharge of lightning accompanied by thunder. |
| n. (event) | 2. lightning | the flash of light that accompanies an electric discharge in the atmosphere (or something resembling such a flash); can scintillate for a second or more. |
| ~ flash | a sudden intense burst of radiant energy. |
| ~ heat lightning | bright flashes of light near the horizon without thunder (especially on hot evenings); usually attributed to distant lightning that is reflected by clouds. |
| ~ sheet lighting | lightning that appears as a broad sheet; due to reflections of more distant lightning and to diffusion by the clouds. |
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