a special medicated collar worn by an animal to prevent it from being infested with fleas
flea collar in American English
noun
a dog or cat collar impregnated with a chemical for repelling or killing fleas
Word origin
[1965–70]This word is first recorded in the period 1965–70. Other words that entered Englishat around the same time include: Finlandization, T cell, double-book, red-eye, stun gun