Source : Webster's Revised Unabridged Dictionary (1913)

Semipalmate \Sem`i*pal"mate\, Semipalmated \Sem`i*pal"ma*ted\,
   a. (Zo["o]l.)
   Having the anterior toes joined only part way down with a
   web; half-webbed; as, a semipalmate bird or foot. See Illust.
   k under {Aves}.