Definition of 準光速 (じゅんこうそく)
じゅんこうそく
                        準光速
じゅんこうそく
junkousoku
noun
•
        
near-light speed, sub-light speed, speed approaching light
Related Kanji
| 準 | semi-, correspond to, proportionate to, conform, imitate | 
| 光 | ray, light | 
| 速 | quick, fast |