Webster's English Dictionary

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bug

1. bug \'b*g\ n [ME bugge scarecrow; akin to Norw dial, bugge important man 
   - mor]e at BIG obs  1: BOGEY, BUGBEAR  2a: an insect or other creeping or 
   crawling invertebrate  2b: any of several insects commonly considered esp. 
   obnoxious : as  2b1: BEDBUG  2b2: COCKROACH  2b3: HEAD LOUSE  2c: any of an 
   order (Hemiptera and esp. its suborder Heteroptera) of insect s with 
   sucking mouthparts, fore wings thickened at the base, and incomplete 
   metamorphosis including many economic pests - called also true bug 3: an 
   unexpected defect, fault, flaw, or imperfection  4: a disease-producing 
   germ or a disease caused by it  5a: FAD, ENTHUSIASM  5b: ENTHUSIAST, 
   HOBBYIST  5c: a crazy person  archaic  6a: a self-important person  6b: a 
   prominent person 
2. bug vt or bugged;  or bug.ging : to plant a concealed microphone in