Prince of the blood
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|the son of a sovereign, or the issue of a royal family. The sons, brothers, and uncles of the sovereign are styled princes of the blood royal; and the daughters, sisters, and aunts are princesses of the blood royal.|
|See under Blood, Consort, and Darkness.|
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.