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The Collaborative International Dictionary
Infrahyoid

Infrahyoid \In`fra*hy"oid\, a. [Infra + hyoid.] (Anat.) Same as Hyosternal (a) .

Wiktionary
infrahyoid

a. (context anatomy English) Below the hyoid bone in the neck; applied to a group of four pairs of muscles in the anterior part of the neck.