The Collaborative International Dictionary of English v.0.48:

Bacilliform \Ba*cil"li*form\, a. [L. bacillum little staff +
   -form.]
   Rod-shaped.
   [1913 Webster]

WordNet (r) 3.0 (2006):

bacilliform
    adj 1: formed like a bacillus [syn: bacillar, bacillary,
           bacilliform, baculiform, rod-shaped]