rosid dicot family

NOUN
18 LETTERS · STARTS WITH R

rosid dicot family is a valid 18-letter word worth 28 points in Scrabble and 30 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
R1O1S1I1D2D2I1C3O1T1F4A1M3I1L1Y4
1 + 1 + 1 + 1 + 2 + 0 + 2 + 1 + 3 + 1 + 1 + 0 + 4 + 1 + 3 + 1 + 1 + 4 =28 PTS
DOUBLE WORD → 56TRIPLE WORD → 84
MEANING

What does rosid dicot family mean?