• (a.) Having the mandibular arch articulated with the hyoid arch and the cranium, as in the cestraciont sharks; -- said of a skull.
Am`phi·sty'lic adjective [ Greek ... + ... pillar, support.] (Anat.) Having the mandibular arch articulated with the hyoid arch and the cranium, as in the cestraciont sharks; -- said of a skull. 
amphistylic Having the mandibular arch articulated with the hyoid arch and the cranium, as in the cestraciont sharks; said of a skull.