The Collaborative International Dictionary of English v.0.48:

Soliped \Sol"i*ped\, n. [Cf. F. solip[`e]de, It. solipede, Sp.
   solipedo; apparently fr. L. solus alone + pes, pedis, a foot;
   but probably fr. L. solidipes solid-footed, whole-hoofed. See
   Solid, and Pedal.] (Zool.)
   A mammal having a single hoof on each foot, as the horses and
   asses; a solidungulate. [Written also solipede.]
   [1913 Webster]

         The solipeds, or firm-hoofed animals, as horses, asses,
         and mules, etc., -- they are, also, in mighty number.
                                                  --Sir T.
                                                  Browne.
   [1913 Webster]