rosid dicot genus

NOUN
17 LETTERS · STARTS WITH R

rosid dicot genus is a valid 17-letter word worth 20 points in Scrabble and 24 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
R1O1S1I1D2D2I1C3O1T1G2E1N1U1S1
1 + 1 + 1 + 1 + 2 + 0 + 2 + 1 + 3 + 1 + 1 + 0 + 2 + 1 + 1 + 1 + 1 =20 PTS
DOUBLE WORD → 40TRIPLE WORD → 60
MEANING

What does rosid dicot genus mean?