1) Agricultural pest insect 2) Western honey bee breed 
Africanized honey bees (also spelled Africanised honey bees), known colloquially as `killer bees`, are a hybrid of the Western honey bee species, (Apis mellifera), produced originally by cross-breeding of the African honey bee A. m. scutellata, with various European honey bees such as the Italian bee A. m. ligustica and the Iberian bee A. m. ibe.....
[n] - a strain of bees that originated in Brazil in the 1950s as a cross between an aggressive African bee and a honeybee
Africanized honey bee noun 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