Definitions for "Trinomial"
A quantity consisting of three terms, connected by the sign + or -; as, x + y + z, or ax + 2b - c2.
Consisting of three terms; of or pertaining to trinomials; as, a trinomial root.
Consisting of, or involving the use of, three terms; as, a trinomial systematic name specifying the genus, species, and variety.
Keywords:  variable, numbers, form
a number that is the form where a, b, and c are numbers and x is a variable