external gill

NOUN
13 LETTERS · STARTS WITH E

external gill is a valid 13-letter word worth 20 points in Scrabble and 25 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
E1X8T1E1R1N1A1L1G2I1L1L1
1 + 8 + 1 + 1 + 1 + 1 + 1 + 1 + 0 + 2 + 1 + 1 + 1 =20 PTS
DOUBLE WORD → 40TRIPLE WORD → 60
MEANING

What does external gill mean?

NOUN · 1 SENSE
1

Occurs in some mollusks and in tadpoles and other immature amphibians.