rigid motion

12 LETTERS · STARTS WITH R

rigid motion is a valid 12-letter word worth 15 points in Scrabble and 18 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

R1I1G2I1D2M3O1T1I1O1N1

1 + 1 + 2 + 1 + 2 + 0 + 3 + 1 + 1 + 1 + 1 + 1 =15 PTS

DOUBLE WORD → 30TRIPLE WORD → 45

MEANING

What does rigid motion mean?