Source : Webster's Revised Unabridged Dictionary (1913)

Leptiform \Lep"ti*form\ (-t[i^]*f[^o]rm), a. [Leptus + -form.]
   (Zo["o]l.)
   Having a form somewhat like leptus; -- said of active insect
   larv[ae] having three pairs of legs. See {Larva}.