Type: Term Pronunciation: in′fră-hī′oyd Definitions: 1. Below the hyoid bone; denoting especially a group of muscles: the sternohyoideus, sternothyroideus, thyrohyoideus, and omohyoideus. Synonyms: subhyoid, subhyoidean Found on http://www.medilexicon.com/medicaldictionary.php?t=44510