Webster's English Dictionary

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binomial

bi.no.mi.al \bi--'no--me--*l\ \-me--*-le-\ n [NL binomium, fr. ML, neut. of 
   binomius having two names, alter. of] L binominis, fr. bi- + nomin-, nomen 
   name - more at NAME 1: a mathematical expression consisting of two terms 
   connected by a plus si gn or minus sign 2: a biological species name 
   consisting of two terms  - binomial aj