syllogistic

from WordNet (r) 3.0 (2006)

syllogistic
    adj 1: of or relating to or consisting of syllogism;
           "syllogistic reasoning"

from The Collaborative International Dictionary of English v.0.48

Syllogistic \Syl`lo*gis"tic\, Syllogistical \Syl`lo*gis"tic*al\,
   a. [L. syllogisticus, Gr. ?: cf. F. syllogistique.]
   Of or pertaining to a syllogism; consisting of a syllogism,
   or of the form of reasoning by syllogisms; as, syllogistic
   arguments or reasoning.
   [1913 Webster]