pond-scum parasite

NOUN
18 LETTERS · STARTS WITH P

pond-scum parasite is a valid 18-letter word worth 25 points in Scrabble and 31 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
P3O1N1D2-0S1C3U1M3P3A1R1A1S1I1T1E1
3 + 1 + 1 + 2 + 0 + 1 + 3 + 1 + 3 + 0 + 3 + 1 + 1 + 1 + 1 + 1 + 1 + 1 =25 PTS
DOUBLE WORD → 50TRIPLE WORD → 75
MEANING

What does pond-scum parasite mean?

NOUN · 1 SENSE
1

An aquatic fungus of genus Synchytriaceae that is parasitic on pond scum.

BROADER