The Collaborative International Dictionary of English v.0.48:

Occiput \Oc"ci*put\, n.; pl. L. Occipita, E. Occiputs. [L.,
   fr. ob (see Ob-) + caput head. See Chief.]
   1. (Anat.) The back, or posterior, part of the head or skull;
      the region of the occipital bone.
      [1913 Webster]

   2. (Zool.) A plate which forms the back part of the head of
      insects.
      [1913 Webster]