color television tube

NOUN
21 LETTERS · STARTS WITH C

color television tube is a valid 21-letter word worth 26 points in Scrabble and 33 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
C3O1L1O1R1T1E1L1E1V4I1S1I1O1N1T1U1B3E1
3 + 1 + 1 + 1 + 1 + 0 + 1 + 1 + 1 + 1 + 4 + 1 + 1 + 1 + 1 + 1 + 0 + 1 + 1 + 3 + 1 =26 PTS
DOUBLE WORD → 52TRIPLE WORD → 78
MEANING

What does color television tube mean?