principal plane

15 LETTERS · STARTS WITH P

principal plane is a valid 15-letter word worth 22 points in Scrabble and 30 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

P3R1I1N1C3I1P3A1L1P3L1A1N1E1

3 + 1 + 1 + 1 + 3 + 1 + 3 + 1 + 1 + 0 + 3 + 1 + 1 + 1 + 1 =22 PTS

DOUBLE WORD → 44TRIPLE WORD → 66

MEANING

What does principal plane mean?