The Collaborative International Dictionary of English v.0.48:

Pharyngeal \Phar`yn*ge"al\, n. (Anat.)
   A pharyngeal bone or cartilage; especially, one of the lower
   pharyngeals, which belong to the rudimentary fifth branchial
   arch in many fishes, or one of the upper pharyngeals, or
   pharyngobranchials, which are the dorsal elements in the
   complete branchial arches.
   [1913 Webster]