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| energy transmitted in wave motion, especially electromagnetic wave motion |
| the distance measured by the propagation of a wave between two successive points in the wave that are characterized by the same phase of oscillation |
| parahydrogen (ˌpærəˈhaɪdrədʒən) | |
| —n | |
| chem Compare orthohydrogen the form of molecular hydrogen (constituting about 25 per cent of the total at normal temperatures) in which the nuclei of the two atoms in each molecule spin in opposite directions | |