| OAP | Office of Adolescent Pregnancy; old age pension, old age pensioner; ophthalmic artery pressure; oste... |
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| ECG | Electro-Cardio-Graphy(-Gram); 심전도 = EKG 1. Conducting System Structu... |
| AACCN | American Association of Critical Care Nurses |
| AACN | American Association of Colleges of Nursing; American Association of Critical-Care Nurses |
| CCC | care-cure coordination; cathodal closure contraction; chronic calculous cholecystitis; chronic catar... |
| critical period | <psychology> A specific stage in animal and human development during which certain types of behaviour normally are shaped and molded for life. (12 Dec 1998) |
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| critical pH | The pH range, about 5.5, at which saliva ceases to be saturated with respect to calcium and phosphate, and below which tooth mineral will dissolve. (05 Mar 2000) |
| critical point | A point at which two phases become identical; thus, at a given critical temperature and critical pressure, the liquid and gaseous state of a particular substance can no longer be differentiated. (05 Mar 2000) |
| critical point drying | <procedure> A method for preparing specimens for the scanning electron microscope that avoids the problems of shrinkage caused by normal drying procedures. Water in the specimen is replaced by an intermediate fluid, for example liquid carbon dioxide, avoiding setting up a liquid/gas interface and then the second fluid is allowed to vaporise by raising the temperature above the critical point, the temperature at which the liquid state no longer occurs. (18 Nov 1997) |
| critical pressure | The minimum pressure required to liquefy a gas at the critical temperature. (05 Mar 2000) |
| critical rate | A heart rate at which aberration or incomplete block will occur; a result of shortening of cycle length so that it barely includes the refractory period. (05 Mar 2000) |
| critical temperature | The temperature of a gas above which it is no longer possible by use of any pressure, however great, to convert it into a liquid. (05 Mar 2000) |
| critical velocity | <biology> The maximum speed a device or organism can sustain over a specified distance or length of time, or the maximum velocity against which device or organism can sustain a position over a specified length of time. <marine biology> Velocity through which a fish will not swim, creating a velocity barrier. (09 Oct 1997) |
| Sudeck's critical point | Region in the colon between the supply of the sigmoid arteries and that of the superior rectal artery. (05 Mar 2000) |
| illumination, critical | <microscopy> The formation of an image of the light source in the object field. The Nelsonian method in which the light source is imaged in the plane of the specimen. A ribbon filament or arc lamp is required to give uniform illumination, the lamp must be focusable, the filament position must be adjustable in all directions. The use of an achromatic condenser is advised. Synonym: Nelson illumination. (13 Jan 1998) |
| achievement age | The relationship between the chronologic age and the age of achievement, as established by standard achievement tests. (05 Mar 2000) |
| age | 1. The whole duration of a being, whether animal, vegetable, or other kind; lifetime. "Mine age is as nothing before thee." (Ps. Xxxix. 5) 2. That part of the duration of a being or a thing which is between its beginning and any given time; as, what is the present age of a man, or of the earth? 3. The latter part of life; an advanced period of life; seniority; state of being old. "Nor wrong mine age with this indignity." (Shak) 4. One of the stages of life; as, the age of infancy, of youth, etc. 5. Mature age; especially, the time of life at which one attains full personal rights and capacities; as, to come of age; he (or she) is of age. In the United States, both males and females are of age when twenty-one years old. 6. The time of life at which some particular power or capacity is understood to become vested; as, the age of consent; the age of discretion. 7. A particular period of time in history, as distinguished from others; as, the golden age, the age of Pericles. "The spirit of the age." "Truth, in some age or other, will find her witness." (Milton) Archeological ages are designated as three: The Stone age (the early and the later stone age, called paleolithic and neolithic), the Bronze age, and the Iron age. During the Age of Stone man is supposed to have employed stone for weapons and implements. See Augustan, Brazen, Golden, Heroic, Middle. 8. A great period in the history of the Earth. The geologic ages are as follows: 1. The Archaean, including the time when was no life and the time of the earliest and simplest forms of life. 2. The age of Invertebrates, or the Silurian, when the life on the globe consisted distinctively of invertebrates. 3. The age of Fishes, or the Devonian, when fishes were the dominant race. 4. The age of Coal Plants, or Acrogens, or the Carboniferous age. 5. The Mesozoic or Secondary age, or age of Reptiles, when reptiles prevailed in great numbers and of vast size. 6. The Tertiary age, or age of Mammals, when the mammalia, or quadrupeds, abounded, and were the dominant race. 7. The Quaternary age, or age of Man, or the modern era. 9. A century; the period of one hundred years. "Fleury . . . Apologizes for these five ages." (Hallam) 10. The people who live at a particular period; hence, a generation. "Ages yet unborn." "The way which the age follows." (J. H. Newman) "Lo! where the stage, the poor, degraded stage, Holds its warped mirror to a gaping age." (C. Sprague) 11. A long time. "He made minutes an age." Age of a tide, the time from the origin of a tide in the South Pacific Ocean to its arrival at a given place. Moon's age, the time that has elapsed since the last preceding conjunction of the sun and moon. Age is used to form the first part of many compounds; as, agelasting, age-adorning, age-worn, age-enfeebled, agelong. Synonym: Time, period, generation, date, era, epoch. Origin: OF. Aage, eage, F. Age, fr. L. Aetas through a supposed LL. Aetaticum. L. Aetas is contracted fr. Aevitas, fr. Aevum lifetime, age; akin to E. Aye ever. Cf. Each. Source: Websters Dictionary (01 Mar 1998) |
| age-class | <ecology> A group of individuals of a species that have the same age. (09 Oct 1997) |
| age distribution | The frequency of different ages or age groups in a given population. The distribution may refer to either how many or what proportion of the group. The population is usually patients with a specific disease but the concept is not restricted to humans and is not restricted to medicine. (12 Dec 1998) |
| age factors | Age as a constituent element or influence contributing to the production of a result. It may be applicable to the cause or the effect of a circumstance. It is used with human or animal concepts but should be differentiated from aging, a physiological process, and time factors which refers only to the passage of time. (12 Dec 1998) |