allantoic membrane

18 LETTERS · STARTS WITH A

allantoic membrane is a valid 18-letter word worth 25 points in Scrabble and 33 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

A1L1L1A1N1T1O1I1C3M3E1M3B3R1A1N1E1

1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 3 + 0 + 3 + 1 + 3 + 3 + 1 + 1 + 1 + 1 =25 PTS

DOUBLE WORD → 50TRIPLE WORD → 75

MEANING

What does allantoic membrane mean?