fleas Definition

flea
noun fleas

1. Any of about 1800 species of wingless, blood-sucking, jumping insects, that live as parasites on mammals (including humans) and some birds.
2. Referring to small crustaceans which leap like fleas.

Example: sand flea
Example: water flea

Idiom: a flea in one's ear

colloq
A reply that is unwelcome or surprisingly sharp; a severe scolding.

Etymology: Anglo-Saxon fleah.