Bi*no"mi*al (&?;), *n.* [L. *bis* twice +
*nomen* name: cf. F. *binome*, LL. *binomius* (or fr. *bi-
* + Gr. *&?;* distribution ?). Cf. __Monomial__.] *(Alg.)*
An expression consisting of two terms connected by the sign plus (+)
or minus (-); as, *a + b*, or *7 - 3*.

Bi*no"mi*al, *a.* **1.**
Consisting of two terms; pertaining to binomials; as, a
*binomial* root.

**2.** *(Nat. Hist.)* Having two names; -- used of
the system by which every animal and plant receives two names, the one
indicating the genus, the other the species, to which it belongs.

**Binomial theorem***(Alg.)*,

the theorem which
expresses the law of formation of any power of a binomial.