[heart.worm] n (1888): a filarial worm (Dirofilaria immitis) that is a parasite esp. in the right heart of dogs and is transmitted by mosquitoes; also: infestation or disease caused by the heartworm
HEARTWORM
Meaning of HEARTWORM in English
Merriam-Webster English vocab. Английский словарь Merriam Webster. 2012