Source : Webster's Revised Unabridged Dictionary (1913)

Trisacramentarian \Tri*sac`ra*men*ta"ri*an\, n. [Pref. tri- +
   sacramentarian.] (Eccl.)
   One who recognizes three sacraments, and no more; -- namely,
   baptism, the Lord's Supper, and penance. See {Sacrament}.