quadratic integer

Etymology
. The idea of integer here is that if the coefficient of the $$x^2$$ term is set to 1 (i.e., if the polynomial is made monic), the other coefficients are integers.

Noun

 * 1)  A number (real or complex) which is a solution to an equation of the form $$x^2 + Bx + C = 0$$ for some integers B and C. For example 42, or 2+3i, or $$1+\sqrt{-3} \over 2$$.

Hypernyms

 * algebraic number
 * algebraic number

Hyponyms

 * / Eisenstein integer