root grafting

13 LETTERS · STARTS WITH R

root grafting is a valid 13-letter word worth 17 points in Scrabble and 20 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

R1O1O1T1G2R1A1F4T1I1N1G2

1 + 1 + 1 + 1 + 0 + 2 + 1 + 1 + 4 + 1 + 1 + 1 + 2 =17 PTS

DOUBLE WORD → 34TRIPLE WORD → 51

MEANING

What does root grafting mean?