Polynomial: An algebraic expression formed by adding or subtracting terms. For example x + 5, 2d - 2.4,
In mathematics, a polynomial is an expression consisting of variables (or indeterminates) and coefficients, that involves only the operations of addition, subtraction, multiplication, and non-negative integer exponents. An example of a polynomial of a single indeterminate (or variable), x, isx2 − 4x + 7, which is a trinomial.
Polynomial comes from poly- (meaning "many") and -nomial (in this case meaning "term") ... so it says "many terms"
Example of a polynomial this one has 3 terms.