retrovert

VERB /rɛtroʊ,vɜrt/
9 LETTERS · STARTS WITH R

retrovert is a valid 9-letter word worth 12 points in Scrabble and 13 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
R1E1T1R1O1V4E1R1T1
1 + 1 + 1 + 1 + 1 + 4 + 1 + 1 + 1 =12 PTS
DOUBLE WORD → 24TRIPLE WORD → 36
MEANING

What does retrovert mean?