a. 1. Of or pertaining to atoms; relating to atomism. [ R. ] [ 1913 Webster ]

It is the object of the mechanical atomistic philosophy to confound synthesis with synartesis. Coleridge. [ 1913 Webster ]

2. divided into separate and often disparate elements; -- the opposite of holistic.
Syn. -- atomistical. [ WordNet 1.5 ]

adj. divided into separate and often disparate elements. holistic
Syn. -- atomistic. [ WordNet 1.5 ]