mercapto radical

16 LETTERS · STARTS WITH M

mercapto radical is a valid 16-letter word worth 24 points in Scrabble and 29 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

M3E1R1C3A1P3T1O1R1A1D2I1C3A1L1

3 + 1 + 1 + 3 + 1 + 3 + 1 + 1 + 0 + 1 + 1 + 2 + 1 + 3 + 1 + 1 =24 PTS

DOUBLE WORD → 48TRIPLE WORD → 72

MEANING

What does mercapto radical mean?