The most common and most likely answer to this crossword clue is the 7 letter word PLANCKS which also is the latest solution we found used in 3Across in 2001.
__ constant (number in physics) crossword clue answers
Here's a list of possible crossword answers ranked by the most likely to least likely.
| Answer | Likelyness | Letters | 
|---|---|---|
| PLANCKS | 100 % | 7 | 
Words with a meaning similar to the clue: __ constant (number in physics)
These words may or may not be a possible solution to this crosswords clue.- coefficient
 - flux
 - frequency
 - spin
 - coherent
 - gravitational constant
 - pulse
 - pulsing
 - constant of gravitation
 - universal gravitational constant
 - abundance
 - parity
 
Crossword Answer definitions
More crossword clues leading to the same solutions
Here's a few more crossword clues - all leading to the identical solution