nictitation

NOUN
11 LETTERS · 4 SYLLABLES · STARTS WITH N

nictitation is a valid 11-letter word worth 13 points in Scrabble and 16 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
N1I1C3T1I1T1A1T1I1O1N1
1 + 1 + 3 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 =13 PTS
DOUBLE WORD → 26TRIPLE WORD → 39
MEANING

What does nictitation mean?