Definition of 回転数 (かいてんすう)
かいてんすう
                        回転数
かいてんすう
kaitensuu
noun
•
        
number of revolutions (i.e. as an engine speed), number of rotations, speed of revolution, speed of rotation
Related Kanji
| 回 | -times, round, game, revolve, counter for occurrences | 
| 転 | revolve, turn around, change | 
| 数 | number, strength, fate, law, figures |