ERASTIAN Meaning of ERASTIAN in English /i ras"cheuhn, -tee euhn/ , adj.1. of or pertaining to Thomas Erastus or Erastianism. n.2. an advocate of Erastianism. [ 1645-55; ERAST(US) + -IAN ] Random House Webster's Unabridged English dictionary. Полный английский словарь Вебстер - Random House . 2012