| hyoid | (adjective) of or relating to the hyoid bone | - |
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| (noun) a U-shaped bone at the base of the tongue that supports the tongue muscles | Synonyms: hyoid bone, os hyoideum |
| hyoscine | (noun) an alkaloid with anticholinergic effects that is used as a sedative and to treat nausea and to dilate the pupils in ophthalmic procedures | Synonyms: scopolamine |
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| hyoscyamine | (noun) a poisonous crystalline alkaloid (isometric with atropine but more potent); used to treat excess motility of the gastrointestinal tract | - |
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