Definition of Irenaeus, St in English:

Irenaeus, St

proper noun

  • (c.130–c.200 AD), Greek theologian, the author of Against Heresies (c.180), a detailed attack on Gnosticism. Feast day (in the Eastern Church) 23 August; (in the Western Church) 28 June.

Pronunciation

Irenaeus, St

/ˌʌɪərɪˈniːəs/