heartworm

[hahrt-wurm]
noun
1.
a parasitic nematode, Dirofilaria immitis, transmitted by mosquito and invading the heart and pulmonary arteries of dogs, wolves, and foxes throughout its range in tropical, subtropical and, more recently, temperate regions around the world.
2.
the disease caused by infection with heartworm.

Origin:
1885–90; heart + worm

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World English Dictionary
heartworm (ˈhɑːtˌwɜːm)
 
n
a parasitic nematode worm, Dirofilaria immitis, that lives in the heart and bloodstream of vertebrates

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Then the holding shelter called to tell me he has heartworm.
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