fermat's principle

18 LETTERS · STARTS WITH F

fermat's principle is a valid 18-letter word worth 27 points in Scrabble and 33 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

F4E1R1M3A1T1'0S1P3R1I1N1C3I1P3L1E1

4 + 1 + 1 + 3 + 1 + 1 + 0 + 1 + 0 + 3 + 1 + 1 + 1 + 3 + 1 + 3 + 1 + 1 =27 PTS

DOUBLE WORD → 54TRIPLE WORD → 81

MEANING

What does fermat's principle mean?