Webster's English Dictionary

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monster

mon.ster \'ma:n(t)-st*r\ n [ME monstre, fr. MF, fr. L monstrum evil omen, 
   monster] obs  1: PRODIGY  2a: an animal or plant of abnormal form or 
   structure  2b: one who deviates from normal behavior or character  3: a 
   threatening force  4a: an animal of strange or terrifying shape  4b: one 
   unusually large for its kind  5: something monstrous; esp : a person of 
   unnatural or extreme ugli ness, deformity, wickedness, or cruelty