Definition of porphyrogeniture in US English:

porphyrogeniture

noun

rare
  • Royal birth; the fact of having been born the child of a reigning monarch.

Origin

Mid 19th century; earliest use found in Thomas De Quincey (1785–1859), essayist. From porphyro- + geniture, after porphyrogenite.

Pronunciation

porphyrogeniture

/ˌpɔːfɪrə(ʊ)ˈdʒɛnɪtʃə/