metacyesis

NOUN
10 LETTERS · STARTS WITH M

metacyesis is a valid 10-letter word worth 17 points in Scrabble and 18 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
M3E1T1A1C3Y4E1S1I1S1
3 + 1 + 1 + 1 + 3 + 4 + 1 + 1 + 1 + 1 =17 PTS
DOUBLE WORD → 34TRIPLE WORD → 51
MEANING

What does metacyesis mean?