| hyomandibular cleft | <anatomy> The cleft between the hyoid and mandibular arches of the embryo; the external auditory meatus is developed from its dorsal portion. Synonym: first visceral cleft. (05 Mar 2000) |
|---|---|
| hyomental | <anatomy> Between the hyoid bone and the lower jaw, pertaining to them; suprahyoid; submaxillary; as, the hyomental region of the front of the neck. Origin: Hyo- + mental of the chin. (01 Mar 1998) |
| hyopastron | <zoology> The second lateral plate in the plastron of turtles. Synonym: hyosternum. Origin: Hyo- + plastron. (01 Mar 1998) |
| hyopharyngeus | Origin, stylohyoid ligament, lesser cornu of the hyoid bone (chondropharyngeal part) and greater cornu of the hyoid bone (ceratopharyngeal part); insertion, pharyngeal raphe in the posterior wall of the pharynx; action, narrows pharynx in the act of swallowing; nerve supply, pharyngeal plexus. Synonym: musculus constrictor pharyngis medius. (05 Mar 2000) |
| hyoscine | <drug> An alkaloid found with hyoscyamine (with which it is also isomeric) in henbane, and extracted as a white, amorphous, semisolid substance. See: Hyoscyamus. Source: Websters Dictionary (01 Mar 1998) |
| hyoscine hydrobromide | Anticholinergic action is similar to that of atropine. Synonym: hyoscine hydrobromide. (05 Mar 2000) |
| hyoscyamine | <chemical> A chemical with the formula C17H23O3N which is a white powder at room temperature and which melts at 108.5 degrees C. It comes from plants such as henbane and belladona. Hyoscyamine is used medically as the levorotatory isomer of racemic atropine and as an anticholinergic alkaloid. (08 Mar 2000) |
| hyoscyamine (6S)-dioxygenase | <enzyme> A 2-oxoglutarate-dependent dioxygenase that catalyses hydroxylation of l-hyoscyamine to 6beta-hydroxyhyoscyamine in biosynthetic pathway to scopolamine; requires fe2+ Registry number: EC 1.14.11.11 Synonym: hyoscyamine 6beta-hydroxylase, hyoscyamine 6 beta-hydroxylase (26 Jun 1999) |
| hyoscyamine sulfate | <drug> An antispasmodic, hypnotic, and sedative, also used in parkinsonism to relieve tremor, rigidity, and excessive salivation. (05 Mar 2000) |
| hyoscyamus | 1. <botany> A genus of poisonous plants of the Nightshade family; henbane. 2. <remedy> The leaves of the black henbane (Hyoscyamus niger), used in neuralgic and pectorial troubles. Origin: L, fr. Gr.; a sow, hog + a bean. Source: Websters Dictionary (01 Mar 1998) |
| hyosternal | 1. <anatomy> Between the hyoid bone and the sternum, or pertaining to them; infrahyoid; as, the hyosternal region of the neck. 2. <zoology> Pertaining to the hyosternum of turtles. (06 Mar 1998) |
| hyosternum | <anatomy> See Hyoplastron. Source: Websters Dictionary (01 Mar 1998) |
| Hyostrongylus rubidus | The red stomach worm of swine; a small reddish trichostrongyle nematode that burrows into the mucosa of the fundus of the pig stomach and sucks blood; moderate numbers appear to cause little damage unless the animal's resistance is lowered by other factors. Origin: G. Hys, gen. Hyos, a hog, + strongylos, round (05 Mar 2000) |
| hyostylic | <anatomy, marine biology> 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. Origin: Gr. A pillar. (06 Mar 1998) |
| hyothyroid | See: thyrohyoid membrane. (05 Mar 2000) |