The Collaborative International Dictionary of English v.0.48:

Splanchnapophysis \Splanch`napoph"y*sis\, n.; pl.
   Splanchnapophyses. [NL. See Splanchnic, and Apophysis.]
   (Anat.)
   Any element of the skeleton in relation with the alimentary
   canal, as the jaws and hyoidean apparatus. --
   Splanch`nap`o*phys"i*al, a. -- Mivart.
   [1913 Webster]