The Collaborative International Dictionary
Hyostylic
Hyostylic \Hy`o*styl"ic\, a. [Hyo- + Gr. ? a pillar.] (Anat.) Having the mandible suspended by the hyomandibular, or upper part of the hyoid arch, as in fishes, instead of directly articulated with the skull as in mammals; -- said of the skull.
Wiktionary
hyostylic
a. (context anatomy English) Having the mandible suspended by the hyomandibular, or upper part of the hyoid arch, as in fishes, instead of directly articulated with the skull as in mammals.