Fungal Growth on Damp Walls
Puzzle 12 of Tattoo Shop Pack
Question is: Fungal Growth on Damp Walls
and the answer is: MILDEW
Word Meaning:
MILDEW — (phytopathology) A growth of minute powdery or webby fungi, whitish or of different colors, found on various diseased or decaying substances.
Definitions from Wiktionary.