| Hypoxia (medical)Hypoxia is a pathological condition in which the body as a whole generalized hypoxia or region of the body tissue hypoxia is deprived of adequate oxygen supply. Hypoxia is often associated with high altitudes, where it is called altitude sickness. Symptom | HypoglycemiaHypoglycemia is a medical term referring to a pathologic state produced and usually defined by a lower than normal amount of sugar ( glucose) in the blood. The term hypoglycemia literally means low blood sugar. Hypoglycemia can produce a variety of sympto | HydrologyHydrology is the study of the occurrence, distribution, and movement of water on, in, and above the earth. As such, it is an earth science. The cycle of movement of water between terrasphere (land), oceanosphere (ocean), and atmosphere (air) is termed the |
| HypertextIn computing, hypertext is a user interface paradigm for displaying documents which contain automated cross-references to other documents called hyperlinks. Selecting a hyperlink causes the computer to display the linked document within a very short perio | HyperthyroidismHyperthyroidism (thyrotoxicosis or "fast thyroid gland") is the clinical syndrome caused by an excess of circulating free thyroxine (T4) and free triiodothyronine (T3), or both. Major causes in humans are Graves' disease (the most common etiology with 70- | HyperCardHyperCard is an application program and a simple programming environment produced by Apple Computer which runs only in Mac OS versions 9 or earlier. It most closely resembles a database application in concept, in that it stores information, but unlike tra |
| HydrodynamicsFluid dynamics Hydrodynamics is fluid dynamics applied to liquids, such as water, alcohol, oil, and blood. Blaise Pascal in the 1600s contributed some of the initial theory to this field. The term originates from the work of Daniel Bernoulli, based on the | Hydrogen bondIn chemistry, a hydrogen bond is a type of attractive intermolecular force that exists between two partial electric charges of opposite polarity. Although stronger than most other intermolecular forces, the hydrogen bond is much weaker than both the ionic | HypnosIn Greek mythology, the personification of sleep ( Roman equivalent Somnus). His twin was Thanatos ("sleep"), death; their mother was the goddess Nyx. His offspring consisted of the things that occur in dreams, the Oneiroi. The four principal of these app |
