| H1-related protein-tyrosine phosphatase | <enzyme> Has tyrosine and threonine/serine phosphatase activities Registry number: EC 3.1.3.- Synonym: vaccinia virus h1-related protein tyrosine phosphatase, vhr ptpase, vh-ptp13 (26 Jun 1999) |
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| H2 antagonist | <pharmacology> A class of anti-ulcer medication which work through the inhibition of basal and nocturnal gastric acid secretion by competitive inhibition of the action of histamine at histamine H2 receptor sites on the parietal cells. Drugs of this type block gastric acid secretion and are therefore clinically useful in treating duodenal ulcers. Examples include cimetidine (Tagamet), famotidine (Pepcid), nizatidine (Axid) and ranitidine (Zantac). (27 Sep 1997) |
| H2 blocker | <pharmacology> A class of anti-ulcer medication which work through the inhibition of basal and nocturnal gastric acid secretion by competitive inhibition of the action of histamine at histamine H2 receptor sites on the parietal cells. Drugs of this type block gastric acid secretion and are therefore clinically useful in treating duodenal ulcers. Examples include cimetidine (Tagamet), famotidine (Pepcid), nizatidine (Axid) and ranitidine (Zantac). (27 Sep 1997) |
| H2 histocompatibility | <immunology> The ability of a tissue to be grafted from a donor to a host, without the host's immune system attacking the grafted tissue. The chances of H2 histocompatibility is determined by how well the tissue proteins (cell surface glycoproteins in the tissue, to be specific) match between donor and host. (09 Oct 1997) |
| H2Q | Symbol for ubiquinol. (05 Mar 2000) |
| ha | An exclamation denoting surprise, joy, or grief. Both as uttered and as written, it expresses a great variety of emotions, determined by the tone or the context. When repeated, ha, ha, it is an expression of laughter, satisfaction, or triumph, sometimes of derisive laughter; or sometimes it is equivalent to "Well, it is so." "Ha-has, and inarticulate hootings of satirical rebuke." (Carlyle) (16 Mar 1998) |
| HA1 virus | parainfluenza virus type 3 |
| HA2 virus | parainfluenza virus type 1 |
| haaf | The deepsea fishing for cod, ling, and tusk, off the Shetland Isles. Origin: Of Scand. Origin; cf. Icel. & Sw. Haf the sea, Dan. Hav, perh. Akin to E. Haven. Source: Websters Dictionary (01 Mar 1998) |
| haak | <marine biology> A sea fish. See Hake. (16 Mar 1998) |
| haarscheibe tumour | Dominantly inherited or nonfamilial elliptical parafollicular mesenchymal hamartomas. Synonym: haarscheibe tumour. (05 Mar 2000) |
| Haase's rule | The length of the foetus in centimeters, divided by 5, is the duration of pregnancy in months, i.e., the age of the foetus. (05 Mar 2000) |
| habena | 1. A frenum or restricting fibrous band. 2. A restraining bandage. Synonym: habenula. Origin: L. Strap (05 Mar 2000) |
| habenal | Relating to a habena. (05 Mar 2000) |
| habenula | A small protuberance at the dorsal, posterior corner of the wall of the third ventricle, adjacent to the dorsal thalamus and pineal body. It contains the habenular nuclei and is a major part of the epithalamus. (12 Dec 1998) |