The Collaborative International Dictionary of English v.0.48:
Acinaciform \Ac`i*nac"i*form\ ([a^]s`[i^]*n[a^]s"[i^]*f[^o]rm),
a. [L. acinaces a short sword + -form: cf. F. acinaciforme.]
(Bot.)
Scimeter-shaped; as, an acinaciform leaf.
[1913 Webster]