Common Cause of Thickened Nails
This page is the CodyCross answer for the clue below from Train Travel, Group 705, Puzzle 4 (Air Conditioning).
Question is: Common Cause of Thickened Nails
and the answer is: FUNGUS
Word Meaning:
FUNGUS — (mycology) A eukaryotic organism of the kingdom Fungi typically having chitin cell walls but no chlorophyll or plastids. Fungi may be unicellular or multicellular.
Definitions from Wiktionary.