Oxford Advanced American Dictionary

Definition of flea noun from the Oxford Advanced Learner's Dictionary

flea

noun
flea pronunciation English fliː flea pronunciation American fliː
 
a very small jumping insect without wings, that bites animals and humans and sucks their blood
The dog has fleas.
Idioms

with a flea in your ear

if somebody sends a person away with a flea in their ear, they tell them angrily to go away