filaria; heartworm
A parasitic nematode worm, especially those causing filariasis or heartworm disease in animals. Used in medical and veterinary contexts.
Canine heartworm disease is transmitted by mosquitoes.
Filarial worms can parasitize the lymphatic system.
From 糸状 (thread-like) + 虫 (worm, insect), referring to the worm's slender, thread-like shape.