Definition of primogenious in US English:

primogenious

(also primogeneous)

adjective

rare
  • = primigenious.

Origin

Early 17th century; earliest use found in Joseph Hall (1574–1656), bishop of Norwich, religious writer, and satirist. Probably from classical Latin prīmogenius, variant (after classical Latin prīmō first, originally) of prīmigenius + -ous, or perhaps variant of primigenious, altered probably after primogeniture and related words.

Pronunciation

primogenious

/ˌprʌɪmə(ʊ)ˈdʒiːnɪəs/