a. [f. (by Newton) L. ambigen-us of two kinds, mongrel (f. amb(i)- both + -gen-us -born, -natured: see -GENOUS) + -AL 1. Absurdly referred by some to genu a knee!] Of two kinds, hybrid. (Used by Newton to describe one kind of hyperbola.)
1727–51. Chambers, Cycl., s.v. Hyperbola, Ambigenal Hyperbola is that which has one of its infinite legs inscribed and the other circumscribed.
