root sheath

11 LETTERS · STARTS WITH R

root sheath is a valid 11-letter word worth 16 points in Scrabble and 14 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

R1O1O1T1S1H4E1A1T1H4

1 + 1 + 1 + 1 + 0 + 1 + 4 + 1 + 1 + 1 + 4 =16 PTS

DOUBLE WORD → 32TRIPLE WORD → 48

MEANING

What does root sheath mean?