jentācŭlum — Lewis & Short
jentācŭlum, i, n.jento,
I a breakfast, taken immediately after rising, by children, valetudinarians, etc. (whereas the prandium was not taken till towards noon):
epulas interdum quadrifariam dispertiebat: in jentacula et prandia et cenas comissationesque,Suet. Vit. 13; Mart. 14, 233:
me inferre Veneri vovi jam jentaculum,Plaut. Curc. 1, 1, 72.