Webster's English Dictionary

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hum

hum \'h*m\ vb or hummed;  or hum.ming [ME hummen; akin to MHG hummen to 
   hum, MD hommel bumblebee] 1a: to utter a sound like that of the speech 
   sound /m/ pro longed 1b: to make the natural noise of an insect in motion 
   or a similar sound :: DRONE 1c: to give forth a low continuous blend of 
   sound  2: to be busily active  1: to sing with the lips closed and without 
   articulation  2: to affect or express by humming  - hum n