vespertilionid

NOUN
14 LETTERS · 6 SYLLABLES · STARTS WITH V

vespertilionid is a valid 14-letter word worth 20 points in Scrabble and 24 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
V4E1S1P3E1R1T1I1L1I1O1N1I1D2
4 + 1 + 1 + 3 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 2 =20 PTS
DOUBLE WORD → 40TRIPLE WORD → 60
MEANING

What does vespertilionid mean?