crown prince

a male heir apparent to a throne.

Origin of crown prince

First recorded in 1785–95

I thought myself the only person who knew that fact—a fact which the Crown-Prince had revealed to me in the strictest secrecy.

The Secrets of Potsdam |William Le Queux
My uncle—he knows something—be careful—warn the Crown-Prince.

The Secrets of Potsdam |William Le Queux
We always took this precaution, because when abroad incognito, both the Crown-Prince and myself frequently changed our names.

The Secrets of Potsdam |William Le Queux
It seemed curious that the young man Schfer should be in such high favour with the Crown-Prince.

The Secrets of Potsdam |William Le Queux

Which was an angry thought to the Crown-Prince in after times, as we sometimes notice.

History Of Friedrich II. of Prussia, Vol. VII. (of XXI.) |Thomas Carlyle

crown prince

the male heir to a sovereign throne