flea

any of numerous small, wingless bloodsucking insects of the order Siphonaptera, parasitic upon mammals and birds and noted for their ability to leap.

either of two common fleas of the genus Ctenocephalides, the very small, black C. felis(cat flea ) or the similar but larger C. canis(dog flea ), both of which infest cats, dogs, and occasionally humans.

any small wingless parasitic blood-sucking insect of the order Siphonaptera, living on the skin of mammals and birds and noted for its power of leaping

any of various invertebrates that resemble fleas, such as the water flea and flea beetle