The Collaborative International Dictionary of English v.0.48:

Infralapsarian \In`fra*lap*sa"ri*an\, n. [Infra + lapse: cf. F.
   infralapsaire. See Lapse.] (Eccl. Hist.)
   One of that class of Calvinists who consider the decree of
   election as contemplating the apostasy as past and the elect
   as being at the time of election in a fallen and guilty
   state; -- opposed to Supralapsarian. The former considered
   the election of grace as a remedy for an existing evil; the
   latter regarded the fall as a part of God's original purpose
   in regard to men.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Infralapsarian \In`fra*lap*sa"ri*an\, a. (Theol.)
   Of or pertaining to the Infralapsarians, or to their
   doctrine.
   [1913 Webster]