| GPC | gastric parietal cell; gel permeation chromatography; giant papillary conjunctivitis; glycophorin C;... |
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| HC | hair cell; hairy cell; handicapped; head circumference; head compression; health care; healthy contr... |
| HEC | hamster embryo cell; Health Education Council; human endothelial cell; hydroxyergocalciferol; hydrox... |
| HTC | hepatoma cell; hepatoma tissue culture; homozygous typing cell |
| HTLV-MA | cell membrane antigen associated with the human T-cell leukemia virus |
| threatened, endangered, and sensitive species | formal classifications of species. Sensitive Species for which population viability is a concern. Sensitive species are not federally designated under the Endangered Species act. The U.S. Fish and Wildlife Service, after study, makes the following designations (05 Dec 1998) |
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| through-and-through laceration | A laceration that penetrates two surfaces of a structure, generally restricted to skin or mucosal surfaces, such as the cheek, lip, ala nasi, pinna, etc. (05 Mar 2000) |
| through-and-through myocardial infarction | Infarction that involves the whole thickness of the heart muscle from endocardium to epicardium. Synonym: through-and-through myocardial infarction. (05 Mar 2000) |
| thymus and parathyroids, hypoplasia of | See third and fourth pharyngeal pouch syndrome. (12 Dec 1998) |
| time and motion studies | The observation and analysis of movements in a task with an emphasis on the amount of time required to perform the task. (12 Dec 1998) |
| Eimeria of sheep and goats | Eimeria ovina (arloingi), the most common and destructive species in sheep, principal losses being in young lambs; Eimeria minakolyakimovae, a highly pathogenic parasite of sheep; Eimeria parva and Eimeria pallida are frequently found but believed to be of low virulence; Eimeria faurei, Eimeria intricata, Eimeria granulosa, Eimeria ahsata, Eimeria hawkins, Eimeria gilruthi, Eimeria gonzalezi, Eimeria christenseni, Eimeria punctata, Eimeria crandallis, and Eimeria honessi, are found in sheep or goats, and are probably of low pathogenicity. All of these species invade the epithelium of the small intestine. Synonym: coccidia of sheep and goats. (05 Mar 2000) |
| to-and-fro anaesthesia | Anaesthesia using of a valveless closed anaesthesia circuit in which respired gases pass back and forth through a carbon dioxide absorbent interposed between patient and respiratory reservoir bag. (05 Mar 2000) |
| to-and-fro murmur | Murmur heard in both systole and diastole of the heart, as in aortic stenosis and insufficiency. Synonym: seesaw murmur. (05 Mar 2000) |
| to-and-fro sound | Doubling of an abnormal murmur usually in systole and diastole and formerly applied to pericardial rubs. (05 Mar 2000) |
| elevator muscle of upper lip and wing of nose | <anatomy, muscle> Origin, root of nasal process of maxilla; insertion, wing of nose and orbicularis oris muscle of upper lip; action, elevates upper lip and wing of nose; nerve supply, facial. Synonym: musculus levator labii superioris alaeque nasi, caput angulare quadrati labii superioris, elevator muscle of upper lip and wing of nose. (05 Mar 2000) |
| elevators and escalators | Mechanical ascending and descending devices which convey objects and/or people. (12 Dec 1998) |
| tooth-and-nail syndrome | <syndrome> Hypodontia associated with absent or very small nails at birth. Common among Dutch Mennonites in Canada. (05 Mar 2000) |
| topping and back pressure turbine | Turbines which operate at exhaust pressure considerably higher than atmospheric (noncondensing turbines). These turbines are often multistage types with relatively high efficiency. (05 Dec 1998) |
| emblems and insignia | Figures or symbols identifying or representing organizations or societies. (12 Dec 1998) |
| embolism and thrombosis | A collective term for diseases characterised by the formation, development, or presence of a thrombus (thrombosis) and the blocking of a vessel by the thrombus brought to its site by the blood current (embolism). (12 Dec 1998) |