critical altitude

17 LETTERS · STARTS WITH C

critical altitude is a valid 17-letter word worth 21 points in Scrabble and 26 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
C3R1I1T1I1C3A1L1A1L1T1I1T1U1D2E1
3 + 1 + 1 + 1 + 1 + 3 + 1 + 1 + 0 + 1 + 1 + 1 + 1 + 1 + 1 + 2 + 1 =21 PTS
DOUBLE WORD → 42TRIPLE WORD → 63
MEANING

What does critical altitude mean?

1