noun
: motion of a fluid (as at the boundary between two layers flowing in opposite directions) in which each individual particle rotates about its own axis — called also rotational motion
noun
: motion of a fluid (as at the boundary between two layers flowing in opposite directions) in which each individual particle rotates about its own axis — called also rotational motion
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012