With of and in the genitive, especially in "sphincter of Oddi". Designating a ring of smooth muscle in the ampulla of Vater, which controls the flow of bile and pancreatic secretions into the duodenum.
Early 20th century; earliest use found in American Journal of the Medical Sciences. From the name of Ruggero Oddi, Italian physician, who described the structure (in Ann. dell'Univ. Libera di Perugia, Fac. di Med. e Chir 2 249, and Arch. Ital. de Biol 8 317).