catarrh
Pronunciation: /kəˈtɑː/
noun

Origin:
early 16th century: from French catarrhe, from late Latin catarrhus, from Greek katarrhous, from katarrhein 'flow down', from kata- 'down' + rhein 'flow'

Spelling help
Spell catarrh with a double r followed by a single h.

catarrh is really rather horrible.