Lewis Short
vĭtellus | vĭtellum, i (noun M.n) : dim.vitulus. *
* A little calf, as a term of endearment, Plaut. As. 3, 3, 77.
* Transf., the yolk of an egg, Cels. 6, 6, 1; Cic. Div. 2, 65, 134; Petr. 33 fin.; Plin. 10, 53, 74, § 148; Hor. S. 2, 4, 14; 2, 4, 57; Mart. 13, 40, 1.—Called also , , , Apic. 4, 1; Varr. ap. Prob. ad Verg. E. 6, 31.
Charlton T. Lewis, Charles Short, A Latin Dictionary