Crossword Genius

The "m" in E=mc^2 (4)

Ross

I believe the answer is:

mass

(Other definitions for mass that I've seen before include "The proletariat" , "Church service - collection" , "Large amount, body" , "RC ceremony" , "Lump of material" .)

I've seen this clue in the USA Today.
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.