articulatio synovialis

NOUN
22 LETTERS · STARTS WITH A

articulatio synovialis is a valid 22-letter word worth 29 points in Scrabble and 34 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
A1R1T1I1C3U1L1A1T1I1O1S1Y4N1O1V4I1A1L1I1S1
1 + 1 + 1 + 1 + 3 + 1 + 1 + 1 + 1 + 1 + 1 + 0 + 1 + 4 + 1 + 1 + 4 + 1 + 1 + 1 + 1 + 1 =29 PTS
DOUBLE WORD → 58TRIPLE WORD → 87
MEANING

What does articulatio synovialis mean?