binomial in WordNet English dictionary

1. (mathematics) a quantity expressed as a sum or difference of two terms; a polynomial with two terms
   binomial 
   

1. of or relating to or consisting of two terms
   "binomial expression"
   binomial 
   
2. having or characterized by two names, especially those of genus and species in taxonomies
   "binomial nomenclature of bacteria"
   binomial  binominal