Any of various small crustaceans that resemble or move like fleas, such as the water flea.
from The American Heritage Dictionary of the English Language, 4th Edition
Any of various small, wingless, bloodsucking insects of the order Siphonaptera that have legs adapted for jumping and are parasitic on warm-blooded animals.
from The American Heritage Dictionary of the English Language, 4th Edition
Any of an order (Siphonaptera) of small wingless bloodsucking insects that have a hard laterally compressed body and legs adapted to leaping and that feed on warm-blooded animals.
from Free Scrabble Dictionary
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