The Collaborative International Dictionary of English v.0.48:

Ensiform \En"si*form\, a. [L. ensis sword + -form: cf. F.
   ensiforme.]
   Having the form of a sword blade; sword-shaped; as, an
   ensiform leaf.
   [1913 Webster]

   Ensiform cartilage, & Ensiform process. (Anat.) See
      Xiphisternum.
      [1913 Webster]

WordNet (r) 3.0 (2006):

ensiform
    adj 1: shaped like a sword blade; "the iris has an ensiform
           leaf" [syn: ensiform, sword-shaped, swordlike,
           bladelike]