| 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 |
| Hyperinflationbillion) Serbian dinar banknote circa 1993, the largest nominal value ever officially printed in Serbia, the final result of hyperinflation. Photo courtesy of National bank of Serbia In economics, hyperinflation is inflation which is "out of control", a c | HydroxyThis prefix in chemical nomenclature indicates the presence of a hydroxyl functional group (-OH). Such groups are found in alcohols, phenols, carboxylic acids and as ligands in inorganic compounds. | HydroxideHydroxide is a functional group consisting of oxygen and hydrogen: :-O−H It has a charge of 1-. The term hydroxyl group is used when the functional group -OH is counted as a substituent of an organic compound. Organic molecules containing a hydroxyl |