| Webster's Online Dictionary |
| Expressions | Domain | Definition | |
| Indirect illumination | Military | Battlefield illumination provided by employing searchlight or pyrotechnic illuminants using diffusion or reflection.a. Illumination by diffusion: Illumination of an area beneath and to the flanks of a slightly elevated searchlight or of pyrotechnic illuminants, by the light scattered from atmospheric particles.b. Illumination by reflection: Illumination of an area by reflecting light from low cloud. Either or both of these effects are present when a searchlight is used in defilade or with its beam spread to maximum width. (references) | |
Source: compiled by the editor from various references; see credits. | Top | ||
