<B>hyperpituitarism, </B>noun.<DL COMPACT><DD><B> 1. </B>excessive activity of the anterior pituitary gland. <DD><B> 2. </B>a condition resulting from this, such as acromegaly. </DL>
<A NAME="hyperplane">
<B>hyperplane, </B>noun.<DL COMPACT><DD> (Mathematics.) a plane in a space of more than three dimensions. </DL>
<A NAME="hyperplasia">
<B>hyperplasia, </B>noun.<DL COMPACT><DD> (Medicine, Biology.) <DD><B> 1. </B>an abnormal multiplication of cells or structural elements of a part or organ. It is a form of hypertrophy. <DD><B> 2. </B>the resulting increase in size of the part or organ. </DL>
<B>hyperplastic, </B>adjective.<DL COMPACT><DD> having to do with or affected with hyperplasia. </DL>
<A NAME="hyperploid">
<B>hyperploid, </B>adjective, noun.<DL COMPACT><DD> (Biology.) <DD><I>adj. </I> having or denoting a chromosome numbergreater than, but not a multiple of, the diploid number for the species. <DD><I>noun </I> a hyperploid number of chromosomes. </DL>
<A NAME="hyperploidy">
<B>hyperploidy, </B>noun.<DL COMPACT><DD> hyperploid quality or state. </DL>
<A NAME="hyperpnea">
<B>hyperpnea, </B>noun.<DL COMPACT><DD> excessively deep or labored breathing. </DL>
<A NAME="hyperpolarize">
<B>hyperpolarize, </B>transitive verb, <B>-ized,</B> <B>-izing.</B><DL COMPACT><DD> to increase the polarity or polarization of. <BR> <I>Ex. Neurons react to an electrical current in fundamentally different ways depending on their location in the brain. Some are depolarized or excited; others are hyperpolarized or blocked (Science News).</I> noun <B>hyperpolarization.</B> </DL>
<A NAME="hyperpyretic">
<B>hyperpyretic, </B>adjective.<DL COMPACT><DD> having to do with or affected with hyperpyrexia. </DL>
<A NAME="hyperpyrexia">
<B>hyperpyrexia, </B>noun.<DL COMPACT><DD> a very high fever. </DL>
<B>hypersensitive, </B>adjective.<DL COMPACT><DD><B> 1. </B>extremely sensitive. <BR> <I>Ex. She was hypersensitive to the slightest criticism.</I> <DD><B> 2. </B>having a high degree of sensitivity. <BR> <I>Ex. hypersensitive film, hypersensitive dye.</I> adv. <B>hypersensitively.</B> noun <B>hypersensitiveness.</B> </DL>
<B>hypersensitize, </B>transitive verb, <B>-tized,</B> <B>-tizing.</B><DL COMPACT><DD> to treat (a substance) so as to make it hypersensitive. <BR> <I>Ex. to hypersensitize film.</I> noun <B>hypersensitization.</B> </DL>
<B>hypersonic, </B>adjective.<DL COMPACT><DD><B> 1. </B>denoting any speed which is five or more times faster than the speed of sound in a given medium. In air, hypersonic speed is at least 5,435 feet per second. <DD><B> 2. </B>that moves or is able to move at this speed. <BR> <I>Ex. a hypersonic aircraft, a hypersonic missile.</I> adv. <B>hypersonically.</B> </DL>
<A NAME="hypersonics">
<B>hypersonics, </B>noun.<DL COMPACT><DD> the branch of aerodynamics that deals with the effects of hypersonic speeds. </DL>
<A NAME="hyperspace">
<B>hyperspace, </B>noun.<DL COMPACT><DD> (Mathematics.) space consisting of four or more dimensions; multidimensional space. <BR> <I>Ex. Although it is not possible to represent such a "hyperspace" pictorially, the computation of distances within it is still quite simple (Scientific American).</I> </DL>
<B>hypersthene, </B>noun.<DL COMPACT><DD> (Mineralogy.) a grayish, greenish-black, or brown silicate of iron and magnesium, an orthorhombic pyroxene. </DL>
<A NAME="hypersthenic">
<B>hypersthenic, </B>adjective.<DL COMPACT><DD> containing or resembling hypersthene. </DL>
<A NAME="hypersurface">
<B>hypersurface, </B>noun.<DL COMPACT><DD> (Mathematics.) a surface in a space of more than three dimensions. <BR> <I>Ex. Albert Einstein ... tried to abolish the endless regress of distance by bending three-dimensional space around to form the hypersurface of a four-dimensional sphere (Martin Gardner).</I> </DL>
<B>hypertense, </B>adjective.<DL COMPACT><DD> excessively tense. <BR> <I>Ex. a hypertense baby that cries a lot (Maclean's).</I> </DL>
<A NAME="hypertensin">
<B>hypertensin, </B>noun. =angiotensin.</DL>
<A NAME="hypertensinogen">
<B>hypertensinogen, </B>noun.<DL COMPACT><DD> a constituent of blood plasma and serum produced by the liver and converted by renin into hypertensin. </DL>
<A NAME="hypertension">
<B>hypertension, </B>noun.<DL COMPACT><DD><B> 1. </B>an abnormally high blood pressure. <DD><B> 2. </B>a disease, especially of the arteries, resulting from or characterized by abnormally high blood pressure. </DL>
<A NAME="hypertensive">
<B>hypertensive, </B>adjective, noun.<DL COMPACT><DD><I>adj. </I> having to do with, characterized by, or affected with high blood pressure. <DD><I>noun </I> a person who has high blood pressure. </DL>
<A NAME="hypertext">
<B>hypertext, </B>noun.<DL COMPACT><DD> a system for storage of information in a computer memory that links blocks or units of documents by subject. <BR> <I>Ex. In its simplest form, "hypertext" is a computer-based technique for accessing information on-line (P.C. Murray).</I> </DL>
<A NAME="hypertextfiction">
<B>hypertext fiction,</B><DL COMPACT><DD> an interactive computer program which provides the user with a basic story and various options for altering it. <BR> <I>Ex. Hypertext fiction [is] a new computer-based format ... affording the reader the opportunity to skip from place to place in the text creating his own story (Sarah Lyall).</I> </DL>
<A NAME="hyperthermia">
<B>hyperthermia, </B>noun.<DL COMPACT><DD> (Medicine.) <DD><B> 1. </B>very high temperature induced artificially as therapy, especially to destroy malignant cells. <DD><B> 2. </B>hyperpyrexia. adj. <B>hyperthermic.</B> </DL>
<A NAME="hyperthyroid">
<B>hyperthyroid, </B>noun, adjective.<DL COMPACT><DD><I>noun </I> <B>1. </B>an excessively active thyroid gland. <DD><B> 2. </B>a person having such a gland. <DD><I>adj. </I> having to do with hyperthyroidism. </DL>
<A NAME="hyperthyroidism">
<B>hyperthyroidism, </B>noun.<DL COMPACT><DD><B> 1. </B>excessive activity of the thyroid gland. <DD><B> 2. </B>the abnormal condition resulting from this, characterized by a high metabolic rate, nervousness, and often an enlargement of the thyroid gland. </DL>
<A NAME="hypertonic">
<B>hypertonic, </B>adjective.<DL COMPACT><DD><B> 1. </B>having excessive muscular tone or tension in response to stimuli. <DD><B> 2. </B>(of a solution) having a higher osmotic pressure than an isotonic solution. </DL>
<B>hypertrophy, </B>noun, pl. <B>-phies,</B> verb, <B>-phied,</B> <B>-phying.</B><DL COMPACT><DD><I>noun </I> an enlargement of a part or organ due to a diseased condition or overuse of the organ. <DD><I>v.t., v.i. </I> to grow too big; affect or be affected with hypertrophy. </DL>
<A NAME="hypervariableminisatellite">
<B>hypervariable minisatellite,</B><DL COMPACT><DD> any of a class of short segments of satellite DNA, containing repeating sequences of base pairs whose number varies from individual to individual. <BR> <I>Ex. Since hypervariable minisatellites are completely specific to an individual, they provide a powerful tool for paternity testing.</I> </DL>
<A NAME="hypervelocity">
<B>hypervelocity, </B>noun, pl. <B>-ties.</B><DL COMPACT><DD> extremely high velocity, such as that of spacecraft or of nuclear particles. </DL>
<A NAME="hyperventilate">
<B>hyperventilate, </B>verb, <B>-lated,</B> <B>-lating.</B><DL COMPACT><DD><I>v.i. </I> to breathe deeply or excessively. <BR> <I>Ex. Preparing for a dive, the ama hyperventilates for five to 10 seconds, takes a final deep breath and then makes the plunge (Scientific American).</I> <DD><I>v.t. </I> to increase the amount of oxygen in (the lungs) by excessive or forced respiration. </DL>
<A NAME="hyperventilation">
<B>hyperventilation, </B>noun.<DL COMPACT><DD> excessive or forced respiration, causing a lowering of the normal amount of carbon dioxide in the blood. </DL>
<A NAME="hyperverbal">
<B>hyperverbal, </B>adjective.<DL COMPACT><DD> excessively verbal. <BR> <I>Ex. He is hyperverbal and is given to self-lacerating bitter tirades (Pauline Kael).</I> </DL>
<A NAME="hypervitaminosis">
<B>hypervitaminosis, </B>noun.<DL COMPACT><DD> a condition caused by an excess of vitamins. </DL>
<A NAME="hypesthesia">
<B>hypesthesia, </B>noun.<DL COMPACT><DD> diminished capacity for sensation; dulled sensitiveness. </DL>
<A NAME="hypesthesic">
<B>hypesthesic, </B>adjective.<DL COMPACT><DD> of or characterized by hypesthesia. </DL>
<A NAME="hypethral">
<B>hypethral, </B>adjective. =hypaethral.</DL>
<A NAME="hypha">
<B>hypha, </B>noun, pl. <B>-phae.</B><DL COMPACT><DD> (Botany.) the structural element of the plant body of fungi, consisting of long, slender, branched filaments, usually having dividing membranes, and together constituting the mycelium. </DL>
<A NAME="hyphal">
<B>hyphal, </B>adjective.<DL COMPACT><DD> of or having to do with the hypha of a fungus. </DL>
<A NAME="hyphen">
<B>hyphen, </B>noun, verb.<DL COMPACT><DD><I>noun </I> a mark used to connect the parts of a compound word, or the parts of a word divided at the end of a line. The hyphen comes in the middle of the line between the top and the bottom of an m or other letter like it. <DD><I>v.t. </I> <B>=hyphenate.</B> </DL>
