flea

Từ điển Oxford Advanced Learner 8th

flea [flea fleas] BrE [fliː] NAmE [fliː] noun
a very small jumping insect without wings, that bites animals and humans and sucks their blood
•The dog has fleas.
Idiom: ↑with a flea in your ear

Word Origin:
Old English flēa, flēah, of Germanic origin; related to Dutch vlo and German Floh.