infante

A son of a Spanish or Portuguese king other than the heir to the throne.

A son of a Spanish or Portuguese sovereign; in specific use as a title, a younger prince of the royal blood. The oldest son or heir apparent in Spain is called Prince of Asturias, and the heir apparent of Portugal was called Prince of Brazil until that country became independent.

A title given to every one of sons of the kings of Spain and Portugal, except the eldest or heir apparent.

Any son of the king of Spain or Portugal, except the eldest or heir apparent.