Crossword Genius

It can be radiant or magnetic (6)

Ross

I believe the answer is:

energy

(Other definitions for energy that I've seen before include "Healthy capacity for vigorous activity" , "Strength, vitality" , "It's measured in joules or ergs" , "Exertion of force" , "life" .)

I've seen this clue in The New York Times.
Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.