vinylidene radical

18 LETTERS · STARTS WITH V

vinylidene radical is a valid 18-letter word worth 27 points in Scrabble and 32 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

V4I1N1Y4L1I1D2E1N1E1R1A1D2I1C3A1L1

4 + 1 + 1 + 4 + 1 + 1 + 2 + 1 + 1 + 1 + 0 + 1 + 1 + 2 + 1 + 3 + 1 + 1 =27 PTS

DOUBLE WORD → 54TRIPLE WORD → 81

MEANING

What does vinylidene radical mean?