Webster's English Dictionary

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flea

flea \'fle-\ n [ME fle, fr. OE fle-a; akin to OHG flo-h flea] 1: any of an 
   order (Siphonaptera) of wingless bloodsucking insects that hav e a hard 
   laterally compressed body and legs adapted to leaping and feed on 
   warm-blooded animals 2: FLEA BEETLE  : an irritating hint or warning : 
   REBUKE  - flea in one's ear