from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A filarial worm (Dirofilaria immitis) transmitted by mosquitoes and parasitic in the heart and associated blood vessels of dogs and other canids.
  • n. The condition resulting from infestation with the heartworm.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A parasitic organism that afflicts dogs.
  • n. The condition caused by this organism.


Sorry, no etymologies found.



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  • heartworm

    n. a relationship or friendship that you can’t get out of your head, which you thought had faded long ago but is still somehow alive and unfinished, like an abandoned campsite whose smoldering embers still have the power to start a forest fire.

    April 14, 2012