The Collaborative International Dictionary of English v.0.48:

Laminiplantar \Lam`i*ni*plan"tar\, a. [Lamina + L. planta sole
   of the foot.] (Zool.)
   Having the tarsus covered behind with a horny sheath
   continuous on both sides, as in most singing birds, except
   the larks.
   [1913 Webster]