The Collaborative International Dictionary of English v.0.48:

Bacillary \Bac"il*la*ry\, a.
   1. Of or pertaining to little rods; rod-shaped.
      [1913 Webster]

   2. (Biol.) Of or pertaining to bacilli; produced by, or
      containing, bacilli; bacillar; as, a bacillary disease.
      [Webster 1913 Suppl.]

WordNet (r) 3.0 (2006):

bacillary
    adj 1: relating to or produced by or containing bacilli [syn:
           bacillar, bacillary]
    2: formed like a bacillus [syn: bacillar, bacillary,
       bacilliform, baculiform, rod-shaped]