The Collaborative International Dictionary of English v.0.48:

Scotist \Sco"tist\, n. (Eccl. Hist.)
   A follower of (Joannes) Duns Scotus, the Franciscan
   scholastic (d. 1308), who maintained certain doctrines in
   philosophy and theology, in opposition to the Thomists, or
   followers of Thomas Aquinas, the Dominican scholastic.
   [1913 Webster]