1. A king’s natural son in France.
2. A young lord.
“Domicellus, Is an old obsolete … Word, anciently given as an Appellation or Addition to the King’s natural Sons in France, and sometimes to the eldest Sons of Noblemen there; from whence we borrowed these Additions: As several natural Children of John of Gaunt, Duke of Lancaster, are stiled Domicelli by the Charter of Legitimation…. But according to Thorn, the Domicelli were only the better Sort of Servants in Monasteries.” Giles Jacob, A New Law-Dictionary (8th ed. 1762).