*yost*

a. [ Hyo- + ternal. ] (Anat.) (a) Between the hyoid bone and the sternum, or pertaining to them; infrahyoid; as, the hyosternal region of the neck. (b) Pertaining to the hyosternum of turtles. [ 1913 Webster ]

‖n. [ Hyo- + sternum. ] (Anat.) See Hyoplastron. [ 1913 Webster ]

a. [ Hyo- + Gr. &unr_; 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. [ 1913 Webster ]

‖n. [ NL., fr. Gr. ka`ryon a nut, kernel + &unr_; a being straitened. ] (Biol.) Direct cell division (in which there is first a simple division of the nucleus, without any changes in its structure, followed by division of the protoplasm of the cell); -- in opposition to karyokinesis. [ 1913 Webster ]