Abel, Niels Henrik Syllabification: (A·bel, Niels Henrik)Pronunciation: /ˈäbəl/Definition of Abel, Niels Henrik (1802–29), Norwegian mathematician. He developed the concept of elliptic functions, independently of Jacobi, and did work on integral equations and power series. Abel, Niels Henrik in other Oxford dictionaries Definition of Abel, Niels Henrik in the British & World English dictionary