Sentence:  "A polynomial P(x<sub>1</sub>, ..., x<sub>n</sub> is called <WSD>"quadral</WSD>" if it splits into a product of quadratic (or linear) functions in the complex field of coefficients." 
Meaning of the word marked with <WSD> tags:  A set of points with all the combinatorial properties of a quadric (a quadric being the set of points of PG("n", "q") whose coordinates satisfy a quadratic equation). (en)