| Word: | 光速 |
| POS: | NN (other noun) |
| Lemma: | 光速 |
| Concept(s): |
光速 (the speed at which light travels in a vacuum; the constancy and universality of the speed of light is recognized by defining it to be exactly 299,792,458 meters per second;) 光速 的 (no_definition) |