The Collaborative International Dictionary of English v.0.48:

Bacillar \Ba*cil"lar\, a. [L. bacillum little staff.] (Biol.)
   1. Shaped like a rod or staff.
      [1913 Webster]

   2. (Biol.) Pertaining to, or produced by, the organism
      bacillus; bacillary.
      [Webster 1913 Suppl.]

WordNet (r) 3.0 (2006):

bacillar
    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]