dis·junc·tive 
(dĭs-jŭngktĭv)
(dĭs-jŭngktĭv)adj.
1. Serving to separate or divide.
2. Grammar Serving to establish a relationship of contrast or opposition. The conjunction but in the phrase poor but comfortable is disjunctive.
3. Logic
a. Of a proposition that presents two or more alternative terms.
b. Of a syllogism that contains a disjunction as one premise.
n.
Grammar
Grammar
A disjunctive conjunction.
dis·junctive·ly adv.