The Collaborative International Dictionary of English v.0.48:

Patripassian \Pa`tri*pas"sian\, n. [LL. Patripassiani, pl.; L.
   pater father + pati, passus, to suffer: cf. F.
   patripassiens.] (Eccl. Hist.)
   One of a body of believers in the early church who denied the
   independent pre["e]xistent personality of Christ, and who,
   accordingly, held that the Father suffered in the Son; a
   monarchian. -- Pa`tri*pas"sian*ism, n.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Monarchian \Mo*nar"chi*an\, n. (Eccl. Hist.)
   One of a sect in the early Christian church which rejected
   the doctrine of the Trinity; -- called also patripassian.
   [1913 Webster] Monarchic