The Collaborative International Dictionary
Hyo-
Hyo- \Hy"o-\ [See Hyod.] A prexif used in anatomy, and generally denoting connection with the hyoid bone or arch; as, hyoglossal, hyomandibular, hyomental, etc.
Wiktionary
hyo-
Etymology 1 pre. (context anatomy English) hyoid; the hyoid bone or arch Etymology 2
pre. pig (attributive)