WordNet (r) 3.0 (2006):

killer bee
    n 1: an investment banker who devises strategies to make a
         target company less attractive for takeover
    2: a strain of bees that originated in Brazil in the 1950s as a
       cross between an aggressive African bee and a honeybee;
       retains most of the traits of the African bee; now spread as
       far north as Texas [syn: Africanized bee, Africanized
       honey bee, killer bee, Apis mellifera scutellata, Apis
       mellifera adansonii]