One of the mysteries of the English language finally explained.
Veterinary Medicine. A disease affecting cattle, sheep, goats, and wild ungulates in parts of Africa and certain tropical islands, which is a vasculitis resulting in pericardial and pleural effusion, haemorrhage into the tissues, and fever, often with prominent neurological signs, and is caused by the rickettsia-like bacterium Cowdria ruminantium, transmitted by the ticks of the genus Amblyomma (bont ticks).
Late 17th century (in an earlier sense). From heart + water, perhaps after German Hertz-Wasser in all senses.
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