cathode luminescence

20 LETTERS · STARTS WITH C

cathode luminescence is a valid 20-letter word worth 31 points in Scrabble and 38 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

C3A1T1H4O1D2E1L1U1M3I1N1E1S1C3E1N1C3E1

3 + 1 + 1 + 4 + 1 + 2 + 1 + 0 + 1 + 1 + 3 + 1 + 1 + 1 + 1 + 3 + 1 + 1 + 3 + 1 =31 PTS

DOUBLE WORD → 62TRIPLE WORD → 93

MEANING

What does cathode luminescence mean?