e/Gonality of an algebraic curve

Information
has gloss	eng: In mathematics, the gonality of an algebraic curve C is defined as the lowest degree of a rational map from C to the projective line, which is not constant. In more algebraic terms, if C is defined over the field K and K(C) denotes the function field of C, then the gonality is the minimum value taken by the degrees of field extensions
lexicalization	eng: Gonality of an algebraic curve
instance of	e/Algebraic curve